iPhone 6 from at&t is slow on tmobile
So i have a iphone 6 64gb, and i got it on an at&t plan. Later on i decided to switch to tmobile. all i can say is i hate it, the only place i get good service is when im at home with perfectly fine wifi. Anywhere else is basically unusable. My mother says she has 0 problems (she uses a samsung S8 active). So my main question is, could my cell service be bad because i have a phone from att? This is what she insists, but i dont think that makes sense. If there is a better sub to ask this in tell me and ill delete the post, thanks!