Do you have a written copy of all your numbers on your mobile . Lots of people lose there phones and not got a copy of there numbers .I do .On loose woman today Linda Robson lost hers and admitted she had not wrote them down .
Yes I have them written down in an old fashioned address book! My old boss always had two SIM cards and downloaded (or is it uploaded) all his contacts on to the spare one and left it in his office in case he lost his phone.
Have all numbers written in last year's diary and copied them into this year's. I have a mid-year diary. All backed up in my little black book which has numbers going back many years and all sorts of useful information I may need from time to time.