Display phone number in the chosen city?

Good day!

Standard situation - the company has several offices in different cities, the site for all single.
Please tell me the example script implements the following in the header you can select the city and next to the displayed phone numbers, the default should be the city of the head office and displayed his number

It should look something like this:
Select city: Moscow Call us: 8 (495) XXX-XX-XX

Click on, and choose say Kazan will

Select a city: Kazan Call us: 8 (XXX) XXX-XX-XX

I would really appreciate your help!
July 2nd 19 at 16:58
3 answers
July 2nd 19 at 17:00
For example, so, or so
July 2nd 19 at 17:02
I did so.
July 2nd 19 at 17:04
guys, thank you very much!

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