Suppose you am living outside US & you want to buy iphone like 4s,5, 5s,5c in US.
Then How can you check the frequency bands of 3G and 4G LTE carriers (in the place u r living) to make sure they are supported by iPhone 4s, 5, 5s, 5c?
So, Each carrier use just 1 band right? or
is there any carrier that require your iPhone to suppose 2 bands?
also, are there 2 or more carriers that use the same band?