Tape-a-Talk is a great app for Ham Radio operations.
I installed Tape a Talk on my Droid Razr Maxx “stupid” phone a few months ago and just found a great use for it. When I’m working HF mobile I record the contacts. I then dictate the contact time and frequency onto the recording and can log the contact on my paper log book and my HRD log book at a later date. Now I don’t miss logging contacts. Someday I’ll start sending QSL cards out.