Apple made a frustrating decision with the iPhone 6s and iPhone 6s Plus. There are two models: one for AT&T and one for the other three carriers. Most notably, the AT&T model cannot connect to Sprint’s or Verizon’s 3G or 2G networks. To some extent, this mirrors what happened with the iPhone 6.

Beware: AT&T’s iPhone 6s Limits Your Carrier Choices