I use T Mobile and I dont have this problem, I mean obviously if your in a Hi Rise Basement loading dock that might be an Issue, I switch on my WIFI, sign on to the GUEST account and go about my day, I have a NOTE 3, it works pretty well anywhere, My Galaxy 2 did as well, again if youve got a cheapie phone you could encounter this but if the phone has WIFI turn it on....
There is a setting in my phone that allows me to set it to use WIFI first as my primary signals, then it switches to 4G LTE..if no WIFI exists, and sometimes it goes to the E which is the slowest signal but still maintains the connection. Anywhere east of the MISS I have no issues unless Im in a very rural area, sometimes I have to find a LOWES or Home Depot and again acess the WIFI if Im in the middle of Bumchuck USA...But generally it works great, 4G LTE 90% of the time...
If Im West of the Miss it works fine on most major Highways, etc...Citys but again if your delivery is the far left corner of Area 51 you can be out of range of anyone except THEM....