So I’ve had this issue for the past few months and now it is getting more common everyday. I have a IPhone 7 with a 02 contract SIM card.
When people call my number from their mobile number or landline the caller I.D will display +7 followed by their actual digits of the number they are calling from. This makes it seem they are calling from Russia. So it happens now and again more than usual now. When they send me a normal sms message their number comes up fine. So this will happen with stores contact and none stores contacts. My regional settings are set to United Kingdom. And I have tried turning phone on and off and removing SIM card.
It is very frustrating as it doesn’t display the contact name so I don’t know who’s ringing.