I've just found that to sign up for Gmail account, I need to give Google my moblie phone number to verify me (they send me SMS message with short code... etc.). So, I'm thinking now, is there such ...
This many not end up being a webapp question but right now it seems to me that the answer will most likely me a webapp of some sort. There are a number of VOIP/SIP/Fax services that I'd like to try ...