No signal

Hi there,<br> <br> I am really struggling with signal <br> <br> I constantly have to reboot my phone and struggle with the 'not registered on network' and super low signal.<br> <br> I have followed all software steps such as 'WSDMA only ' etc etc.<br> <br> This problem has been occurring since I returned from a trip to China. I am not sure if that could have had an effect but I have factory reset my phone since I have been back.<br> <br> This is driving me crazy I at best have 1 bar of signal<br> <br> Please help thank you<br> <br> I live in Newlands, Cape Town