The American version of the iPhone5 sticker turned out to be a mobile card. I want to change a Unicom card now. Can I send text messages online after I change it? Version 6. 1.4.

The American version and other foreign versions of iPhone can be divided into locked version and unlocked version. The unlocked version can be directly inserted and used, and the locked version needs to be pasted. However, the card needs the corresponding system version. For example, the original 4.0 version of the card can not be used after upgrading to 5.0. In fact, the principle of card stickers is to disguise the signals of domestic operators as those of foreign operators and be recognized by mobile phones. Therefore, in order to use the Internet access function, cellular data, 3G function and data roaming must be turned on at the same time.

If you have a locked mobile phone, you may need a card that matches your mobile phone system to use Unicom's mobile phone card. However, not all mobile phone card stickers can match the network of domestic operators.

Because there are relatively many mobile phone models, different mobile phones have different functions. Please consult your mobile phone after-sales staff for details.