Adobe, the creator and owner of Flash, is no longer supporting/updating Flash for phones. Please note there are third-party apps that will display Flash videos; however, we cannot recommend a third-party app.
If you need any further assistance with this question, please contact the Sonim Customer Experience Center at 1-833-MY-SONIM (1-833-697-6646) or email us at [email protected]. We are open 24 hours a day, Monday-Friday and we will further assist in troubleshooting.