Default [Q] Sprint S3 connects to 3g while S4 doesn't?

My friend has a Sprint S3 and I have a Sprint S4. We went camping last weekend and at the site service was very spotty. He was able to connect to 3g service on his S3 while I was only able to connect to roaming voice with no data on my S4. It wasn't like it was even coming in and out of 3g it just would not connect at all to data. I am running stock software and am fully updated. I tried changing my phone from 3g/LTE to just 3g and that made no difference. I turned off roaming and set it to just home network and it gave me no signal whatsoever. Can anyone explain this? Shouldn't the S4 work better than the S3?