Handcent problem

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http://androidforums.com – Hi all. I'm hoping that someone can help. I recently got a Galaxy s2 and installed Handcent on it as I liked it on my old HTC. Yesterday I tried to send txts via this and it wont work. I just get a message saying 'message not sent'. I reset all the settings and have even uninstalled and reinstalled the app but to no avail. The stock messaging app works ok so I know theres not a problem with txts etc. Thanks for any help or advise. (General)