Hi all. I am new to Android and this forum, so first of all, I would like to say "Hi there! Please to meet you all." Recently I have installed Go SMS Pro to replace my stock messaging on HTC Sensation. Everything looks good. However, I am facing one problem. When trying to send a message to a friend, most of the time the message comes back with a "message failed to send" notification. Yet after a couple of seconds, a toast message comes up saying "message received by (my friend's name)" (I turned on delivery report). She does received the message. After that the problematic message is marked as "sent" (a tick). It doesn't happen all the time, but it kind of annoys me. Sometimes I thought my message was not sent successfully and tried to resend, but my friend ended up receiving two copies of the same SMS, and also deducting my credit twice. I have tried Handcent SMS, and if I remember right it too has this problem. My stock messaging app works perfectly. In all cases, receiving messages is perfectly fine. I doubt it is my network problem. Is anyone using Go SMS Pro or any other non-stock messaging apps having the same problem? Any help/advice is greatly appreciated. Thank you very much.