No provider can give you a one hundred percent guarantee that a proxy won’t stop working the next day. However, some providers thoroughly filter their proxy addresses so you don’t end up with dead ones at all, while others simply sell unchecked bundles. You can look through the technical testing and comparison of mobile proxy providers here: https://gologin.com/blog/top-10-mobile-proxy-providers-technical-testing-and-comparison/ . After that, you can decide for yourself which provider is the best option for your needs.