I had same problem. First upgraded my flash version to 1.11 from HP site. Problem got resolved for sending SMS, but this problem was also there when I tried to use tools->options, with the result that I was stuck in "vibrate" mode.
I kept fiddling and surprise !! I went to start->settings->system->connections->gsm/gprs settings. When I clicked on the same, I got the message "SIM Card not found". Then I chose manual configuration of network parameters and chose the country and operator. Bingo! no more messages asking me to wait for 15 seconds!