Hey! I have been using OBI Worldphone SF1 32GB phone for about 3 months and I found it great. I had no problem what so ever. The best thing I loved about OBI Worldphone SF1 32GB phone is its design. I has a great design. I know the brand name is not that popular but looking at its design people cannot resist to have a feel of it. I seriously loved its design. Phone works great. there are some lag also but not the serious ones to discuss about. Yes the phone gets heated sometimes and I guess it is because of the 4G that I am running on this phone. Overall great phone. I hope OBI guys put some more effort to bring more products and to bring the brand name up. Thanks!