IMPORTANT NOTE: When apple does iOs updates it sometimes disconnects the Panasonic Link2Cell connection...
To fix this you need to:
1.) to UN-pair [refer to your Panasonic users manual, mine was #6111] on your Panasonic phone ON THE MAIN BASE PHONE [not the secondary handsets]
2.) Unplug Panasonic main base from power and telephone line for 5 minutes
3.) "Forget This Device" in your iPhone's bluetooth settings for the Panasonic phone
4.) Turn OFF your bluetooth on your iPhone
5.) Power off your iPhone
6.) Power everything back up and plug everything back in
7.) RE-pair according to your Panasonic phone manual
I hope this helps someone... it took me hours to figure out.