Hello. About two weeks ago I switched carriers from Sprint to T-Mobile and since then I've been unable to change the APN settings on my phone to use their 3g/4g network. I've been back and forth between the two carriers looking for a solution to my issues but I've had no luck. I've tried searching online, looking through some sort of hidden menu that I'd need a code for and I've had zero luck. I've come here hoping to find a solution to my problem, any help would be greatly appreciated!