Salt Lake City, Utah, and Austin, Texas. So if you don't live around one of those two locations, ISIS is useless to you. Verizon has also blocked Google Wallet although the carrier blames this on Google's app for the service, which Big Red says tries to access certain secure parts of the hardware.
T-Mobile customers are asking for the ability to choose between Google Wallet and ISIS, especially since the latter is available in only two locations. But for the carriers, the potential rewards for building out its own mobile payment service far outweigh having to deal with the complaints from those who want to use Google Wallet.