curious how you intend to handle abuse? Maybe have an sms sent to the recipient first and they must confirm? I was just able to enter the example number ("555-555-5555") and it seems to process just fine (currently "Status: Operator on the line! Trying to connect you...") even though I clearly don't own that number. I could cause problems for both customer service people and cellphone users with this. I'm assuming you don't do any of this based on the video though, I'm unable to test as I'm in the UK.

Excellent idea!