[banden]

Most of your issues are likely related to not having an SD card. Opening attachments requires that you download them first, contacts need to be stored on the sd card (onlyl so much fits in cache), copying text from emails is easily done in touchdown.

Im not certain about setting up a mobile hotspot, I know that you can get wifi tether going but that's only one device at a time and it does require root. If you're a tweeker you'll probably want to root anyways. The sholes smupdater application is probably the most straightforward and as a plus it also includes the wifi tethering. (Rooting can void your warranty.)