Can't live without my PDA phone or smartphone. Everything's there. Phone, emails, camera, GPS, Internet, music, Bible etc. I can even tether it to my laptop as a wireless modem. But, on it's own, its technically a handheld PC. My smartphone is HTC Tilt. You may want to go with same or equivalent.
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Jim
SD90,Korg I3, KMA Liverpool,TC Helicon Play Electric, Fender Sonoran Guitar, vArranger, Bose S1 Pros, Bose L1 Compact, Aiwa Exos-9