Saw no way to post across multiple Android OS. Using an online app "www.keepcalling.com. Has worked flawlessly for years until a number of mobile devices replaced others. JAVA was installed to all of the new hardware yet each device produces the message: "JAVA Required" How can one troubleshoot such an issue? Have Android devices ranging from Android 4.1.1 to 5.1.1. Have no meaningful expertise in troubleshooting this and I know that support is being withdrawn for many JAVA offerings. Seeking informed guidance.