I think AT&T's LTE is fast as heck, but I hate that I can't get more than 5GB of data. I travel all the time, and I use it for tethering, etc. I go over every month by a gig or two. I'm tempted to switch to T-Mobile, but I actually purchased a T-Mobile pre-paid data-only SIM to do head to head testing on my phone in various locations.... their LTE service can't compare at all. Anyhow, back to my original question, possible to call them up and get more data?