On Verizon and staying here as well. Switched to Sprint for a short amount of time but was very unhappy with it and came back to Verizon shortly thereafter.
Been with Verizon for over 20 years but they do not seam to care about that. I was about to move to T-Mobile but Verizon came up with a new plan that worked better for me but I had to fight hard and be lied to by several people at Verizon to get on it.
I am currently on Verizon and plan to stay with Verizon. Other than them costing more than most other providers, their coverage and service is still top notch in my area.