[gTen]

Ok guys, to clarify a few things:

Biggest difference of Ad-Hoc vs Infrastructure is that Ad-Hoc tends to be limited to WEP and not all devices pick up Ad-Hoc connections. Also from using Ad-Hoc and infrastructure, I noticed Ad-Hoc were somewhat less stable.

Not sure about Evo 3d but some devices can do both. Try the newest beta 3.0 version of wifi tether to see if it can do infrastructure.

Also, tethering is not illegal. It is just a violation of your terms of service. So in worst case they just suspend your service. Though usually they will send you a warning first.

As for using tethering and 4G, usually the phones have a problem with using 4g and wifi at the same time...it thinks 4g is like wifi. I remember some beta builds on the epic were the same were the 4G was not working around the wifi so 4g tethering was impossible on those beta builds using official hotspot.