I need to know who's this?
 Aug 22nd, 2012
When I text to people I know on my contact list and have their correct numbers in my phone, it's showing up as:

+1 21611611 784 Error Invalid Number. Please resend using a valid 10 digit mobile number.

I'm sending texts to people who have been programmed into my phone for a year and getting this message. So strange.
Diane Smith
 Jul 20th, 2010
Stop this phone call!
J Reeds
 Jun 07th, 2010