The GUI must be sleek and written using QT. It should support windows, Mac, iPhone and android platforms.

Tags: Android, choose iphone android symbian windows, cross platform application iphone android, cross platform iphone android sms, iPhone, iphone android blackberry windows developer, iphone android cross platform sms, iphone android design platform, mobile dialer iphone android windows mobile, phonegap iphone android cross platform, platform, secure sms iphone android symbian windows mobile, symbian iphone android mobile platforms