The question of which operating system (OS) is more prevalent among smartphones in various regions of Russia — Android or iOS — was addressed in a study conducted by T-Bank. Overall, it can be said that Android-based smartphones enjoy widespread use throughout Russia. However, in the highest strata of society, the iPhone holds a clear advantage. Notably, Dagestani residents stand out as the most prominent users of iPhones, followed closely by the residents of Chechnya and Moscow.