The charger should still work without problem as should the traffic receiver. Does it charge it regardless of the message?

I hope you don't mean it doesn't show the App icon at all, only that it shows the icon ok but your phone is no longer linked, or that BT is disabled? If you just have to re-ink then follow the manual [p9 in the dezl manual, p10 in the RV's], or the OB help, it's the same procedure for both units. If BT's disabled then go to Settings>Bluetooth and enable it.