IIRC, you only need the phone # for the pdaapps' client. or you can use their email addy...

you dont have to neccessaroily subscribe to vision to send sms.. you can use it but will be charged..

if you know someone on sprint, just send them a sms at #.messaging.sprintpcs.com or verizon or whom ever..

if you want you and i to play with it just send me a PM and we can play...