Would changing radios make a difference for me?

[nsxnext]

Pardon my when it comes to the subject

I am a Sprint customer
At my client site I roam on Verizon's network which in turn kills battery life (constantly get the roaming message).

Is there a specific radio that would be better for me? Keep in mind, Verizon has a tower on the roof of one of the buildings here.

Thanks everyone.