How can I add a contact to my XP3?

https://www.youtube.com/watch?v=lMOUSszrgSw   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

My device turns off on its own. Why?

Remove the SIM card and reboot without the SIM card inserted.  If the phone continues to reboot, please contact the Sonim Customer Experience Center at 1-833-MY-SONIM (1-833-697-6646).  We are open