My Sprint iphone4S has a lock and a sticker. After upgrading ios7, I can't send SMS and activate cellular mobile data network.

This is a common failure after upgrading a locked machine. Just change the card.

Card sticker is an ultra-thin chip covering SIM card. When the SIM card with the card sticker installed is inserted into the iPhone, the iPhone begins to verify the IMSI. The function of the card sticker is to give him a feedback from the original operator IMSI, let him pass the verification, and then register the mobile phone to access the network. Among them, the role of the card sticker is to provide the original operator's IMSI to be verified by iPhone, and on the other hand, to register the available network with the information of the real SIM card. Card stickers play a role in interfering with the verification process of mobile phones.