The rectangular shaped thin card known as SIM CARD gives power to the phone notwithstanding the electric or battery energy conferred upon the handset. This miniature card allows mobile users get into the stream of cellular technology with all of the data stored on board the tiny chip. The information pertaining to phone number, contacts or phone book, mobile banking, messages, and other data is stockpiled on it.

Your sim card brings you to the reach of the mobile service providers in your area to avail of its network benefits. Conversely, every network carrier generates its own sim card for use of the consumers who prefer prepaid plans. It holds your ID to the network to activate your phone and let you use a particular network. If for instance Verizon produces your sim card, you cannot use the same card for T-Mobile, Sprint, Cingular or AT&T. Other networks likewise generate their own respective sim cards.

You might have heard about the convenience of changing numbers and networks using prepaid phone and sim card. That is a fact. Nevertheless, you do not necessarily use the same sim card to access the services of other networks. You need to change the sim card and make use of another. This is precisely one of the advantages of prepaid technology. You can switch numbers by purchasing another sim or swapping your sim for another, and insert it with your unlocked phone. An unlocked phone is a handset that can be used with any other networks in the whole world. Hence, if the place of your tour destination is in a country with prepaid network, you can bring your phone handset with you without necessarily having to apply for any confusing roaming bundles. Just buy the sim card that can be used to such foreign country, then presto, you are in! You shall not incur long distance or roaming charges because you posses the local number of your destination. Some sim card can store contacts from 250 to 500.

Because you can conveniently switch sim, it gives you the flexibility to choose which network service to use at any time. If the other network encountered problems, you can immediately take off the back cover of your handset and remove the sim card to insert another.

Some people think prepaid phones are not as good as postpaid. The features are just the same. You can proceed anywhere and use your WIFI handset to surf the internet, listen to mp3 mobile player, watch video, capture photos, edit your word format documents, send text messages on time, go mobile banking and pay your bills while on the go, reload your credit, edit your photos, send files through Bluetooth or infrared, and avail of other common phone and network features.

Prepaid phone cards reload your sim card credit. Without a credit on board, you can only use the mobile features of your phone without capability of calling or sending text messages. However, it is easy to reload credit. You can go to your favorite stores or purchase loads online.