1. Login to phone account through web interface
  2. Go to Settings -->  Date & Time
  3. Change NTP server as ntp2d.mcc.ac.uk 
  4. Change time zone from Auto to GMT +0 (London, Great Britain)
  5. Untick the box (Allow DHCP Option)
  6. Don’t change other value, set as By Default.
  7. Click on Save and Apply