If i put my samsung sim card to iphone does the at&t know i use iphone now instead my samsung?
If i put my samsung sim card to iphone does the at&t know i use iphone now instead my samsung?
No, they will not. But check whether the iPhone is not locked to any other network.If it is, then you need to unlock it. I suggest you can approach Classicunlocking.com and specify the country,locked network of iPhone.Based on the availability you can get the permanent unlock service along with free instructions.