How to replace "8" and "+7" with "*" at the beginning of the number in current versions of Android?

Question

Android

To implement calls through the FMTN platform of one of the mobile operators, you need to have a prefix * and a 10-digit number before dialing. But the problem is that when entering the definition, either +7 or 8 still glows, and in order to call back, you need to do routine inconvenient actions, like "change and call", replace +7 or 8 with * by hand. Is it possible to do this with regular means of fresh versions of Android? Or advise a dialer who can do this, preferably free.

Answer 1

You can use a custom dialer application that will substitute the prefix
Dialer GR - Prefix & Suffix