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Prepaid mobile phone

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Title: Prepaid mobile phone  
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Prepaid mobile phone

Typical signs showing where refills can take place.

A prepaid mobile phone (also commonly referred to as pay-as-you-go, pay-as-you-talk, pay and go, or prepaid wireless) is a mobile phone for which credit is purchased in advance of service use. The purchased credit is used to pay for mobile phone services at the point the service is accessed or consumed. If there is no available credit, then access to the requested service is denied by the mobile phone network. Users are able to top up their credit at any time using a variety of payment mechanisms.

The alternative billing method (and what is commonly referred to as a mobile phone contract) is the postpaid mobile phone, where a user enters into a long-term (generally lasting 12, 18, or 24 months) or short-term (also commonly referred to as a rolling contract or a 30-day contract) billing arrangement with a mobile network operator or carriage service provider (CSP).

"Pay-as-you-go", "PAYG", and similar terms are also used for other non-telephone services paid for in the same way.


  • Overview of the prepaid service 1
  • History 2
  • Prepaid versus postpaid mobile services 3
    • Advantages of prepaid 3.1
    • Disadvantages of prepaid 3.2
  • Churn 4
  • Prepaid mobile phones and roaming 5
  • Privacy rights and prepaid mobile phones 6
  • International prepaid mobile phone branding 7
  • Financial accounting issues arising for operators 8
  • Usage 9
  • See also 10
  • References 11

Overview of the prepaid service

A prepaid mobile phone provides most of the services offered by a mobile phone operator. The big difference is that with prepaid phones, payment for service is made before use. As calls and texts are made, and as data is used, deductions are made against the prepaid balance amount until there are no funds remaining (at which time, service is no longer available). A user may avoid such a break in service by making payments to increase the remaining balance.

Methods of payment:

  • Credit card or debit card[1]
  • Direct draw from bank account using an ATM[2][3][4]
  • Retail store purchase with a "top-up" or "refill" card at retail. These cards are stamped with a unique code (often under a scratch-off panel) which must be entered into the phone in order to add the credit onto the balance.
  • Retail store purchase using a swipe card where the balance is credited automatically to the phone after the retailer accepts payment.
  • Retail store or online purchase: a person can top-up a prepaid phone in another country by asking for “international top-up”. Often, migrant workers will send prepaid top-up internationally as a form of support.
  • Other mobile phones on certain networks which provide international top-up services, where the initiator of the top up is often a migrant worker wanting to add minutes to the prepaid mobile phone of a family member back home.
  • Direct from some open-loop prepaid cards featuring a mobile refill service.
  • Through electronic reloading where a specially designed SIM card (Retailer's SIM card as used to define in the Philippines and India) is used to reload a mobile phone by entering the mobile number and choosing the amount to be loaded. This process is widely implemented in the Philippines and India so that any person can be a prepaid load retailer, creating a nationwide availability of reloading stations, even in remote areas.

Credit purchased for a prepaid mobile phone may have a time limit – for example, 90 days from the date the last credit was added. In these cases, customers who do not add more credit before expiration will lose their remaining balance.

There is no compulsion on a prepaid mobile phone user to top up their balance. To maintain revenues, some operators have devised reward schemes designed to encourage frequent top-ups. For example, an operator may offer some free SMS to use next month if a user tops up by a certain amount this month.

Unlike postpaid phones, where subscribers have to terminate their contracts, it is not easy for an operator to know when a prepaid subscriber has left the network. To free up resources on the network for new customers, an operator will periodically delete prepaid SIM cards which have not been used for some time, at which point, their service (and its associated phone number) is discontinued. The rules for when this deletion happens varies from operator to operator, but may typically occur after 6 months of non-use.

By 2003, the number of prepaid accounts grew past contract accounts, and by 2007, two thirds of all mobile phone accounts worldwide were prepaid accounts.


The history of the prepaid mobile phone begins in the 1990s, when larger markets were being sought after by the mobile phone operators. Before this date, all mobile phone services were offered on a post-paid basis, which excluded people with a poor credit rating.

One of the first pre-paid card was called "Mimo" and was launched by TMN the Mobile Phone Operator of Portugal Telecom in September 1995.[5] In 2006 Swisscom celebrated a ten-year's success story with it's product and service "NATEL(R) easy" which also holds a patent on the topic "Prepaid mobile subscriber identification card and method implemented thereby" [6][7]

Prepaid versus postpaid mobile services

Advantages of prepaid

A prepaid plan may have a lower cost (often for low usage patterns e.g. a telephone for emergency use) and make it easier to control spending by limiting debt and controlling usage.[8] They often have fewer contractual obligations – no early termination fee, freedom to change providers, plans, able to be used by those unable to take out a contract (i.e. under age of majority). Depending on the local laws, they may be available to those who do not have a permanent address, phone number, or credit card. This makes them popular amongst students away from their home towns and also travelers. Additionally, they are popular with parents who wish to have a way to stay connected with their college age students but do not want the surprise of an unexpected and lofty bill.

Disadvantages of prepaid

Sometimes, pay-as-you-go customers pay more for their calls and SMS messages, and in some cases they are limited in what they can do with their phone – calls to international or premium rate numbers may be blocked, and they may not be able to roam. These limitations are usually the results of a system deficiency whereby the prepaid system used by the wireless carrier as technology has evolved to the place where all this is easily managed by triggers and/or APIs to 3rd party solution providers (data, international LD, content, roaming). Current models being deployed by wireless carriers today are capable of setting the price points for all services on an individual basis (via packages) such that higher pricing is a marketing decision. The days of higher pricing being due to more expensive network costs no longer apply.


As described above, prepaid accounts require that a subscriber have funds in the account to make outgoing calls (except emergency calls, which are always allowed). In the US, incoming calls are also barred, while in some other countries, a prepaid mobile with zero balance may still receive calls and texts.

This results in an "on/off" or "all or nothing" proposition for the prepaid service providers and their clients (that is, the account either has enough credit to use the phone, or it does not). Some operators (for example, Orange) allow their pre-pay customers to have a small negative balance to allow short calls or texts when the customer's credit has been completely used. This is then deducted when the customer next adds more credit.

The time most likely for a prepaid customer to switch to a different service provider is when the prepaid account reaches a "zero credit balance". Like other service providers, mobile service providers losing a mobile account call it "churn."

Prepaid mobile phones and roaming

In the early years, prepaid mobile phones could only be used within the operator's network from whom the customer purchased the phone. It was not possible to roam onto other GSM networks when using the phone abroad. This was because the operator had no way to bill calls in real time from another network.

However, most prepaid phones now offer roaming using one of the following methods:

  • The prepaid mobile phone user dials a "trigger" number from the foreign location using a USSD message which is not charged for while roaming. Upon receipt of the USSD, the customer's operator will then return the call. When the service calls back, the user is being charged for the cost of the service from the credit available in the home network. The service will then prompt the user to enter the dialed number of the party to be called. The disadvantage of this method of roaming is that the user will not be able to dial numbers directly from the handset. The advantage is that it works in almost all locations around the world since USSD is ubiquitous and free.
  • The user can direct dial from their handset if the network they are roaming in supports CAMEL (Customized Applications for Mobile networks Enhanced Logic). This allows real time billing by the home operator without having to dial the customer back. The advantage is that it is more natural and works seamlessly. The disadvantage is that not all networks support CAMEL so the list of countries where a prepaid customer can use their phone abroad is smaller than for postpaid mobile phones.

Privacy rights and prepaid mobile phones

As of July 2013, at least 80 countries globally (including 37 on the African continent) have mandated, or are actively considering mandating, the registration of prepaid SIM users.[9]

The reason is a concern of police and security agencies that anonymous use of prepaid mobile services facilitates criminal or terrorist activities.

Prepaid phone users can be anonymous for two reasons:

  • In certain countries the prepaid SIM card can be sold in a shop like any other goods. There is no need to register them at point of sale, unlike postpaid phones who have to credit check the user before allowing them to purchase and enter into a contract.
  • Prepaid services can often be topped up using cash and vouchers, there is no way to trace the payment and hence determine the identity of a prepaid phone user from payment records.

While there is no doubt that criminals and terrorists use prepaid SIM cards to help stay anonymous and avoid easy detection, to date there has been no empirical evidence to indicate that:

1) Mandating the registration of prepaid SIM users leads to a reduction in criminal activities; and

2) The lack of any registration of prepaid SIM users is linked to a greater risk of criminal or terrorist activities. In fact, a publicly available policy assessment report from Mexico showed that mandatory SIM registration introduced there in 2009 had failed to help the prevention, investigation and/or prosecution of associated crimes. As a result, policymakers decided to repeal the regulation three years later.[9]

A prepaid phone specifically purchased to be used briefly and then replaced is known colloquially as a burner phone or burner. A Los Angeles technology company currently offers a mobile application of the same name that replicates this functionality for a smartphone.[10]

International prepaid mobile phone branding

In an effort to differentiate the prepaid from post-paid service for their customers, CSPs have branded prepaid services differently from the post-paid services.
A variant of post-paid service has emerged in recent years that comes closer to the prepaid service, by offering a "pay monthly" contract.

Prepaid phones and SIMs in the United Kingdom are known as "Pay as you go".[11][12]

Financial accounting issues arising for operators

Prepaid services pose a number of challenges for the accountants at the mobile phone operator.

The financial statements for the company must treat prepaid services differently from their postpaid services. When a user makes a top up payment, it may not be declared immediately as revenue for the business. Instead, it is treated as deferred income and only enters the accounts as income once services are actually consumed. The sum of the unused balances from all customers effectively is treated as a liability in the balance sheet. Since the unused balance remains as a liability on the balance sheet until consumed, it is commonplace to set a life cycle (perishable quality) on the amount of the top up, whereby any unused amounts will be swept from the account converting them from a liability to income. Typically, the larger top up values will have a longer time to be consumed before expiring and being swept.

Another issue is the treatment of VAT for operators in the European Union. Typically a prepaid top up will attract VAT in the home country at the point of sale. However, roaming calls made between countries in the EU are treated as a trade in services between EU members and are hence subject to VAT reversal on the wholesale level.

Sometimes the operator's proposition itself has unintended side effects on the financial statements. For example, the top up rewards described above encourage frequent top up. However competition between operators in some cases has pushed rewards to the point where a customer can get the majority of their calls and text free by topping up a certain amount each month. This makes it harder for a user to "burn through" their balance and allow the top up revenue to actually enter the operator's books as revenue. Current prepaid solution providers are now able to manage each top up individually to avoid such loss of accounting control. The business rules set by the wireless carrier will dictate the circumstances when/if earlier top ups could have their perishable dates extended.


Usage of prepaid cellphone service is common in most parts of the world. Around 70% of customers in Western Europe and China use prepaid phones with the figure rising to over 90% for customers in India and Africa.[13] 23% of cellphone users in the United States were using prepaid service as of 2011, a share that's expected to rise to 29% by 2016.[14] Prepaid SIM cards are also becoming a variation of the traditional prepaid cellphone plans. Rather than needing to purchase an entirely new phone, existing phones can be used by simply replacing the SIM card within the device.[15]

See also



  1. ^ Pay by Credit card
  2. ^ up at a cash machine
  3. ^ Euronet Worldwide Launches ATM Recharge Services for Hungary's Largest Mobile Operator. - Free Online Library. (2002-02-05). Retrieved on 2013-08-20.
  4. ^ Top up for Prepaid mobile or mobile broadband | Vodafone NZ. Retrieved on 2013-08-20.
  5. ^ "Portugal Telecom FAQ". Retrieved 25 October 2015. 
  6. ^ "Prepaid mobile subscriber identification card and method implemented thereby". Retrieved 25 October 2015. 
  7. ^ "NATEL® easy - a ten-year success story". Retrieved 25 October 2015. 
  8. ^ Prepaid Wireless Plans
  9. ^ a b "The Mandatory Registration of Prepaid SIM Card Users"
  10. ^
  11. ^ Pay as you go
  12. ^ Pay as you go
  13. ^ Cyrus Farivar (2012-06-14). "Die, contracts! Prepaid mobile phone use surges".  
  14. ^ Brian X. Chen (2012-08-02). "Prepaid Cellphones Are Cheaper. Why Aren’t They Popular?".  
  15. ^ "campusSIMs Provides SIM cards to International Students". 
  16. ^
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