Your phone number and some of your contacts are linked to your SIM card. In many cases when you get a new phone, you can simply transfer your SIM card to the new phone and make and receive calls on it as if you were using the old phone to do so.
Some mobile phones use SIM cards, other don't. The phones with SIM card slot allow the user to change the SIM; this way you can change the telephone number, or you can log to different networks (providers). SIM cards have not any alternative solutions.
Cellphones usually have a SIM card. There are land lines that do not as well as Satellite phones also do not have SIM cards.
yes they do all have sim cards also on a different note the t-mobile phones accepts the cingular sim cards when unlocked and vice versa
Cellcom in Wisconsin does not have sim cards, wish they did. I have heard that you can get a sim card from them but non of their phones have a spot for sim cards.
There is no such thing as a CDMA SIM card, since CDMA phones do not use SIM cards.
Yes, Virgin Mobile now uses the sim cards on new phones.
Yes
Not all cell phones are compatible with SIM cards. Some only work with a contract, and you need to unlock the phone before you can use a SIM card.
The iPhone uses the micro SIM card
There are many mobile phones that do not require a SIM card, it depends on the service provider. Any phones from Sprint and Verizon do not use SIM cards.
the AT&T network, and the T-Mobile network both use SIM cards I know that Nextel and Sprint also use sim cards.
yes