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Because in the US all GSM devices (ones that require a SIM card) are SIM locked to their respective carrier (AT&T or T-mobile). Before you can use your SIM in another carrier's device you must get the SIM Unlock Code (some call it a Subsidy Unlock Code) from the service provider that the device was manufactured for and then they will also give you the instructions for inputting the code into your device.
What else can I help you with?
Can you make international calls from the USA using majic jack?
I believe it used the internet to make phone calls. Which means you wont need a phone card.
Why won't my Samsun Galaxy Mini recognize my SD Card?
I didn't know phones use mini SD cards? I think you mean micro. And there is probably some damage to either the card, the whole phone or the bit that reads the card. Try another card in the same phone, try the same card in another phone. That way you'll know which has the problem...-Elliotop______
If you take out the sim card off a i phone you dont have topay?
If you take the sim card out of your iphone then you wont have service peroid. Doesnt matter if the sim card is out and you have no service on your phone, your still paying no matter what.
Why do phone always break?
because that is wat they do they were of like a shoe but your sim card wont break
Why wont my att sim card work in a t-mobile phone?
An AT&T sim card will not work in an T-Mobile phone as it is locked to particular carrier itself... If you want to put your AT&T sim in your T-Mobile phone you can try unlocking your phone
If cell phone GPS will track your Sim card or your actual phone If you leave your phone somewhere and take the Sim card with you will it track the Sim card or the phone?
The GPS tracker is in the phone, not the card. But when you use that sim card in another phone the identity of the sim card will give away the location of the new phone - which then can be tracked by its GPS.
Can you put your sim card from a regular nokia flip phone into a old iPhone no1 is using?
Yes, but if your flip phone's plan is using prepaid plan, you wont be able to .
Why do the apps on the i phone flash on then wont work?
You have to buy another game to prove you own all the games
What if your girlfriend calls from another guys phone and when i ask her about it she says its a friend but wont tell me who?
Your girlfriend's cheating
What do you do when meez wont let you make an account anymore?
make another email adress on yahoo or something and make another account
What would happen if you voted using another nation's phone number at Eurovision?
Do you mean using another nation's phone number that those people can use to vote for your country? If so, dont try it. It is cheating and it wont work! The telephone number will be connected to that countries national phone operator. Your phone in your country wont be connected to that operator so I dont think it will work. Sorry!
What is the advantage of having a memory card slot feature built into a phone?
well having a memory card built in is ALOT easier! Because you wont have to go all the way out to the store and buy a fifteen dollar memory card.
