I have found MTS to be pretty good for landline phones, internet, and TV as far as customer service, but their cell phone business, which operates pretty well as a standalone business, is TERRIBLE.
I am going to move from MTS the moment the "hopefully" new iPhone comes out in June/July.
I can't wait to get away from MTS. They treat me like crap and yet I've been a customer of theirs for 15 years.
Their service, reception, etc. has gotten worse and worse in the last 2 or 3 years. I don't know why. Maybe because they are putting their money into the IPTV, and siphoning it from the mobility end, even though if you phone MTS, they "send" you over to mobility, and they act like they don't even know the rest of MTS exists.
"...just me up on my pony on my boat."