WiFi usb adapter is a WiFi card.
No. There's an iPad WiFi and an iPad WiFi + Cellular. The iPad WiFi will only be able to access the internet when you're within range of a WiFi network. The iPad WiFi + Cellular is able to access the internet within range of WiFi and on a 3G network. To access the 3G network you will however have to use an active simcard.
iPhones need a SIM card to work as a phone. If you don't have a SIM card you can use it as an iTouch.
Provided the handset is not locked to a network and it's a micro sim card you use, yes.
No, it does NOT need a sim card. In fact, Verizon doesn't even use sim cards. If you want to put music on your Voyager, you might buy a Micro SD card. ^ it does have a sim card people!!!! youtube blackberry pearl sim card!! under the battery!!
all iphones have a sim slot but on the original iphone the customer cannot easily access it whereas the 3G iphone has the sim card and a sim card ejector tool How can I access my verizon iphone 4 sim card slot that doesn't have a sim tray
No.
Certain blackberry have sim Card Like Tmobile , at&t, And Nextel . Boostmobile ,sprint , and Verizon blackberry donot have a Sim >
iPad2 comes with two models. One with wifi and another with wifi+3G. iPad2 wifi model can connect to Internet via wifi. Another version have two options. If you are in home with wifi you can connect to it. When you are outside, say at friends home where he don't have wifi, you can use 3G service. For 3G service you need authentic SIM card with 3G service enabled on it.
Many tablets do use Wi-Fi, and some even have 3G options. It depends on the tablet.
There is only a SIM card slot in the 3G and 4G LTE iPads. The WiFi only models don't have a mobile radio, so a SIM slot would be useless.
When you get a sim card, it has it's own unique telephone number on it. When you insert the sim card you have that number. You can however get a code and keep your existing number and use it with a new sim card.