Q: Could not activate cellular data network

I have an iPhone 6, just paid my T-mobile bill and then this happened, could not connect to cellular to use data, surf, etc.

This solution worked fine!

Thank you!

Thanks very much for the tip! "Deleting Vodafone Profile" worked for me! I was so frustrated because my cellphone provider and also Apple couldn't help me out with this problem. I guess they have no clue what's going on!

Thanks rob9099. Worked for me after I was prompted to delete the existing profile. General>profile>cellular profile>delete profile and follow the prompts.

I also want to add to the original post, go to settings, Genera,l VPN, and delete any configurations that are not Apple certified.  I have a Keepgo sim that i use when I travel around the world and when I install the APN its works everywhere when I travel. But I need to remember to delete the APN configuration when I come back home.

Thank you so much rob. This is a very old post, but I absolutely have to thank you for solving my problem. I had the "could not activate cellular data network" problem for over a year now after I put my SIM card into a used iphone. It still seems unreal to me that the problem is fixed. Again, thank you so much!

I Know it's an old thread but I recently have this problem.  The solution offered by Koblenz is exactly how to resolve it. Thanks a million!