Since IOS 7.4 update, can't send messages

[jestrella0910]

Since I updated my iPhone 4S and iPad 4th to 7.4, I can receive text or i-messages but cannot respond. Is there a fix?

 

[meashishnd]

1. trying to disable imessage than reactivate it .. if this not work try 2nd options
2. reset network settings and activate it
sure u get working again