thank you very much for your question. My name is***** and I will try to help you as quick possible.
Can you please let me know which mobile phone you are using?
Thanks for your patience and best regards,
If you go to your contacts, what exactly happens?
Yes, if you let me know what exactly happens when you try to open your contacts? Are they empty?
OK, do you have a backup of your Lumia somewhere?
When did the contacts disappear, what did you do before?
OK, thank you. I am opening your question up for other experts, since I am out of ideas on this one. Thank you, ***** ***** and best regards,