Hi guys which telco is the best in maintaining a number ? I have a SOX, validity until 2022. Is there any similar telco that offers long validity ? Because I'm trying to maintain my second number. Thanks

I have 2 sox number actually. But one of them got ported out to UMOBILE that was my main number. Another one I'm keeping it as my secondary number. Gooding yo but now I'm buying another good number for my brother from Korea. He will be coming back once per year and before this always buy a prepaid umobile sim pack and will throw it away after finish using. So this year I'm planning to buy a slightly better number so that I can maintain it for him. Is there any telco out there that gives long validity ?