Open Question: T-mobile or Sprint - which one has better 3G coverage & is less expensive?

I need to switch from verizon cuz it’s too expensive. I also need a smartphone w/pda cuz I need to download clinical material like Lexi-Comp for medications on it. I know an i-touch will give me all that but I was hoping there could be a phone that can give me the same thing b/c i don’t wanna be carrying around 2 devices.

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