Iphone 3gs sends SMS, but the send button is gray. What should I do?

Ha ha. Have you installed the enhancement plug-in? I met them, too. After upgrading to 3.2 1, there is a [theme] when sending short messages, and below the theme is the place to edit the content of short messages. If you choose the wrong one, it is useless to click the gray button when sending it.

Mine is 3gs. If it's not as simple as I said, brushing will solve it ... hehe. Anyway, brushing the iphone is just like everyday life.