I am using aT-Mobile USA G2 device- HTC product.. I was able successfully install the 3CX softphone but it would not register to the SIP server. The only message I see on the top right is "Not registered".. I have also installed 3CX softphone on my laptop using the same wifi connection and it works fine. I am using the same credential as the one in windows (ie, user,password,external server,proxy..etc) but no luck.. anything special for this device? ..I can use the browser on the device without any issues....application installed correctly from Andorid market place..any help is appreciated..cheers