The "could not activate cellular data network" error means your iPhone won't be able to use the mobile data you're paying for ...

iPhone users have reported that their device is stuck on “SOS mode,” preventing them from making calls or sending text messages amid a major cell phone outage Thursday affecting thousands of users ...

Once you’ve activated your iPhone with your carrier, it should continue to work on the cellular network without any problems as long as you’re within range of a tower. Nevertheless, the vagaries of ...