Can you please turn off your phone, pull out your Verizon SIM card, turn your phone back on and try sending any text message? The easiest test - send it to yourself.
Are you getting any errors or you can send and receive text messages without any problem?
For some reason, I cannot receive or send any text messages when I pull out Verizon SIM card. I discussed this issue with several Verizon representatives, they all told that my SIM card should not affect my ability to send or receive text messages in USA, but it does. They asked me to factory reset my phone several times, but nothing changed. They ended up insisting I keep my SIM in without finding any explanation to this phenomena.
I just would like to find out if I'm the only one with this problem.
NOTE: I apologize, this test is for Droid 2 Global users located in USA (people who bought their phones from Verizon and still have Verizon SIM card).