If you have an older 3G smart phone on a defunct Android OS version, but no new phone, its probably because you just need an approach that fits. Now you can get a World Sim Card, that is pay as you go with free incoming and texting. You can also update your browser, YouTube and get a VOIP client for that phone so that you can make calls by Wifi instead of a cell tower. https://en.wikipedia.org/wiki/List_of_free_and_open-source_Android_applications
To install these apps, which all seem pretty trustworthy, look for and download the APK file onto your desktop or SD card then connect your phone by USB or same SD card, to install these by the APK files (which are like EXE files).