Seems like others having a similar problem.
No data on one of my FP phones. Works fine on wifi. Double checked that the account is active and that APN is set to fp.com.attz. Tried uninstalling and reinstalling Messaging, that did not help. Signal is strong, The icon shows a connection to AT&T with an exclamation point (!). Phone is a Nexus 4 on Android 5.1.1. I have several other FP phones, they are still working.
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