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one reason is that , your phone is network locked which makes it imppossible to use other SIM cards, you can unlock it using unlock codes from http://www.simpleunlocking.com/
P.S> the above links specified by azkehhobe returns to a Blank Blogsopt site
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I'm assuming that your phone is locked, If so, read on.
If your phone is not unlocked, this please ignore everything set forth below,
Let me give you a little background and then some solutions. This is generic because I don't know your carrier. I'm using ATT as an example.
Phones are naturally unlocked, but a service provider might lock them
When originally manufactured, all GSM cell phones are unlocked. That is, they can be used with any SIM from any cellphone service provider - always assuming, of course, that the cellphone service provider has compatible GSM service on the same frequency bands that the phone can operate on.
Most cell phone service providers electronically 'lock' the phone so that it can only be used with their service. There are obvious reasons why they choose to do this - in particular, to force you to pay what are usually very high roaming charges when you take your phone out of their network and use it elsewhere in the world.
Fortunately, this locking is reversible. With some phones, it is possible to simply enter an unlocking password code into the phone and it is immediately then unlocked. Other phones need to be connected up to a special unlocking data terminal.
Your phone has to be unlocked by the carrier. LG, Motorola, Sony Ericsson, Nokia and most of their ilk, will not give consumers the unlock codes but don't despair.
A PUK (PIN Unlock Key) code is required to unlock SIM cards that have become locked following three successive incorrect PIN entries. If your SIM card becomes locked, you will need to get a PUK code from your carrier. For example, if you have AT&T to unlock your SIM card, you can obtain your phone's PUK code from AT&T by:
? logging in to your my wireless Account online ? using their Technical Support Chat ? calling Customer Care at 1-800-331-0500
To get your phone's PUK code online from ATT:
? Log in to your my wireless Account. ? Select My Services under My Account. ? From the My Services screen, select My Phone/Device. ? Select Unblock SIM Card. ? The Unblock SIM screen will display your PUK code.
Once you receive your PUK code, you will need to enter it into your phone to set a new PIN code.
Note: If you enter the wrong ATT PUK code 10 times in a row, your SIM card will be invalidated, and you will need to purchase a new SIM Card. The phone will display the following error: "PUK blocked call operator."
There are three other ways to unlock a phone:
? The carrier will unlock the phone for you at one of its retail outlets; ? You can do it yourself by clicking on this link Free Unlock Codes , ? Pay $3.89 at the following website: www.theunlockshack.com/. I have absolutely no affiliation or relationship with The Unlock Shack or its principals.
I trust that this is helpful and solves your problem. All the best
if you have an active account with att just call them and tell them you are leaving the country for a while and they will give you the code so long as your account is active ...if not you have to purchase the code online
try the default code for the phone (usually found in the manual- try finding the manual). it is often 0000. don't try the code more thn 3 times or it will be locked, and you'll need a phone shop to unlock it.
IF U ARE USING THE SAME CARRIER AS BEFORE (ATT FOR EXAMPLE) IT WONT NEED UNLOCKED. IF U WERE GIVEN A NEW SIM CARD FROM UR CARRIER WHEN THE NEW PHONE WAS BOUGHT, THEN YOU WILL HAVE TO USE THE SIM CARD. THE CARRIER ATTACHES THE SIM CARD NUMBER TO UR ACCOUNT. YOUR OLD ONE CAN BE USED ONLY TO ACCESS YOUR CONTACTS, BUT NOT TO MAKE CALLS.YOU CAN HOWEVER PUT THE OLD SIM CARD IN UR NEW PHONE FOR THE SOLE PURPOSE OF TRANSFERRING UR CONTACTS, THEN REPLACE YOUR NEW SIM CARD INTO UR NEW PHONE