I have the samsung galaxy s3. I switched from mobilicity to koodo on Sep 10 and haven't been able to send texts. I can receive texts, outgoing/incoming calls work, as well as data. Just can't send texts. Well actually there is an exception to that. I've tried test texting many people on my contact list and I can successfully send texts to 2 people, one on Telus and one on Bell. No one else though. I called koodo technical help and the rep did her best to help me. We pulled the battery, sim card, etc. In the end she said she had to put in a ticket to engineering. I thought I'd try here to see if anyone had any ideas? Thanks.