Unable to send text messages after updating to iOS 5
Hello everyone! Please help me figure out how to fix this problem with my iPhone 3GS. I have just installed an iOS 5.0 to my iPhone 3GS successfully which I got from Apple. After that I was wondering why I cannot send message using SMS. I tried using iMessage, and I can use the feature without problems. I can also receive text messages. But the problem is I cannot send any SMS messages. How can I fix this?