They do not all require it.
Wi-Fi only PSVitas do not need a SIM card, indeed, there's no slot for one.
3G ones need a SIM card if you're going to be using the 3G network, as it's a mobile internet service and the SIM card is how your mobile internet identity is stored.
All mobile networks require a SIM card or similar.
A SIM free phone is one that does not have a SIM card included with the phone. This type of phone may not be able to be used with all networks. Some networks require a SIM card.
Yes the iphone 4 uses whats called a micro sim card it is smaller then the regular sim card out there. At www. phonetraderonline.com they can custom cut your existing sim card or provide you with a micro sim for your carrier.
As AT&T is a GSM service provider all of their devices require a SIM card to operate on their network
A sim free mobile is a mobile phone that can be bought which is unlocked to any network. i.e: can be used on any network, and not specifically one eg; o2. ~ AshJordan
Any cell phone that is unlocked requires a SIM card to work. If you own a Sidekick cell phone that is unlocked you are able to use a carrier other than T-Mobile. For this reason, it will require a SIM card to work.
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.
You call your carrier and activate your sim card.
The plural form of SIM card is SIM cards.
sim card
sim card
A SIM card adaptor will allow you to use a micro SIM in a standard SIM slot.