Best mobile network to go on?

Hi, I want to switch from giffgaff as I've been having problems with this network. I have an iphone and I'm looking for a sim card that has an unlimited data deal?

Please mention in your area man
I have at&t i find it good i have also used sprint network but it's sh#t. (In US)

GiffGaff operates on the o2 network, so avoid that if you've been having issues. The only true UNLIMITED data, is on 3, and they allow tethering. So that seems like your best choice.

Edit: Just realised you are in the US, not UK, so my answer is irrelivant.

Version

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