If you don't mind having a different incoming number the cheapest way would be to get a local SIM chip in whatever country you are in.
If you would be receiving a lot of calls from different people then this would be complicated as your number would change in each country. For making calls this would be the most economical in my opinion.
If you would be receiving a lot of calls from different people then this would be complicated as your number would change in each country. For making calls this would be the most economical in my opinion.