Prepaid SIM Card

[samson]

A postpaid SIM card permits the user to talk for as long as they like. The calls are logged and the user is billed monthly for the talk time and other services used, such as outgoing text messages and the purchase of ring tones. It's usually a requirement for postpaid cell phone SIM cards that a credit card be on file with the carrier, as they are providing a service in advance of payment that can easily amount to hundreds of dollars if the user isn't careful.

[edayln]

Prepaid SIM cards have a time limit on how long the credit is available for use. When this time expires, the balance is lost unless the user has already reloaded their account. Reloading in advance of expiration usually allows the balance from the previous period to carry over in addition to the new credit amount.