American carriers:
Well known international carriers:
yes, provided the network carrier provides the micro sim required for the phone.
4G refers to the carrier not the phone maker ... and the carrier for that phone does have a 4G network...
From iPhone 4 and beyond you can use simple software to unlock your phone. The 3GS is not able to unlock your phone unless you buy a special SIM card or take it to a different carrier
If you are experiencing problems with your iPhone 4, please contact your carrier as the iPhone 4 must be maintained by a certified specialist. To answer this question: There are two screws located on the bottom of the phone. Please keep note that you must not "fix" the phone by your self. The phone needs a specialist in this field.
An iPhone 4 can be purchased at any carrier of the iPhone. And any Apple in-store or online store.
Yes, actually it's the only carrier you can buy the iPhone 4 from in the US.
orange and blackberry
No you don't because if you told the carrier your phone you jail broke your phone it could get bricked. Bricked means its deactivated and you can't use it anymore. Technically jailbreaking you phone is legal but if you buy any free apps with it then they brick you phone if they find out.
If you lost your mobile phone, you will need to contact your carrier. If you have an Apple phone, you can check the Find My iPhone app to see where the phone is.
The OS 8 is for the iPhone 4. The iPhone 4 is a really popular phone.
The IPHONE 4 is by far the best.
Iphone