In general, now there are a lot of offers from telecom operators with good favorable tariffs for all calls in roaming. And if the offer from this or that operator is more interesting than the one you are using now, you can change the operator with saving the number. You can buy Simtravel services.

Also in Turkey you can buy a SIM card from Vodafon, which is also profitable. Sim card itself costs about 150 RUB. Incoming calls will be free of charge