The following are a few quick steps in order to unlock the additional iPhone abilities within Grid3 (like sending/receiving text messages). The only thing you will do ahead of this fix is to ensure that your iPhone is running OS 13 or higher.
Go to the iPhone’s Settings
Select Bluetooth on the left
Tap the blue circle with the ( i ) next to your Trilogy (The name of your Trilogy will look similar to “DESKTOP-0JPR1G2” as it does in the image below)
Turn on the permissions for ‘Show Notifications’ and ‘Sync Contacts’
Open Grid 3
Go to Settings
Select Phone on the left
Where your phone is listed on the right select “Disconnect”
Once it disconnects this option should change to “Connect”, select “Connect” to reconnect with the new permissions
The phone should now show that you can text and use the other features.