Unfortunately ..........has stopped

[grenshoot]

virtually every call i try to make i get Unfortunately contacts had stopped or com.android. phone has stopped.  I have repeatedly tried to delete the cache under contacts app and even the data (wiping all my contacts) they were backed up on pc so no issue.

I have tried re boot and leaving off for a while.

This is drving me insane - i never thought i would say this but i am missing my old blackberry now.

PLease help and please do not say delete cache or re boot - believe me i have tried these repeatedly. 

[Thommo]

Try an App preferences reset - Open Settings then tap the 3 dots then reset app preferences - Reboot and test

[Thommo]

Also consider performing a system repair using PC Companion as this will often fix issues - This will factory reset your phone

Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)
Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the on screen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process

If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP

[Uliwooly]

Don't forget to backup

Alternatives on How to backup Xperias

http://talk.sonymobile.com/thread/36355

[grenshoot]

Thank you, the restore to factory worked and phone now working but not syncing calandar since - have posted seperately on this just now.