You should be able to still use it via the wifi connection. But as far as the hotspot are you planning to use it off of your phone if so you should be fine.
Re: Is there a way to calibrate the touch screen?
Go to settings, display and it should show up with G Sensor Calibration. Follow the instructions on screen and it should fix your issues.
Make sure your mobile network is active under settings. If it is toggle the airplaine mode to on which disconnects the service wait about 30 seconds then turn the airplane mode to off and it should come up with the data.
Congrats on being a new android user! One I have never had great experience using drop box. Once you upload something they shouldn't delete from drop box. The reason that you have two identical folders is one is for your DCIM which is on your sd card the other one is used for drop box itself...
I have 2 GS3 that were on ATT and I had them unlocked. Will I have full functionality on the phone with any other GSM carrier? I really need an answer. I am selling them and want to make sure I have all bases covered.
Not necessarily. If its unbreakable then the repair world will not make money. The repair companies won't be able to make profit, which would bring unemployment and economic loss in all aspects of the world.