On Google, I found a similar problem on Reddit, which describes exactly what I've got right now: https://www.reddit.com/r/cyanogenmod/comments/3xm0mo/mobile_data_not_working_cm13/
The problem is that, even though I do have cellular reception, and everything (WiFi, SMS, calling) works just fine, whenever I turn off WiFi (or walk outside WiFi) it doesn't connect to the internet using a data connection (3G/4G etc).
What I've tried so far (based on that Reddit post's comments)
- Reboot my phone
- Toggle Airplane mode on/off
- Switch preferred network setting to 3G and then back to 4G
- Enable Data Roaming (even though I'm still in the country this should be active)
- Going to Settings>Cellular networks>Access Point Names and trying each of the available options
- Check my remaining MB-credit on my subscription (I still have >100MB remaining) - this is actually irrelevant since I do not have an exclamation point at my reception-icon
The only thing I haven't tried is some kind of reinstall/rollback of my OS. My Cyanogen version is 13.0-ZNH0EAS45F
When I go to my SIM 1 status, I see that "Service status" says "Data: In service", but (even though my WiFi is turned off) the "Mobile network state" is "Disconnected". Can I force my phone to connect to the mobile network somehow?
PS: This problem has existed for about 2 hours now. Before that it worked just fine.
Update: One of these things might have fixed it. I'm not sure. It suddenly started working again, even though between the time of posting and now I did not change anything about my settings at all. I have (after it started working) reverted all changes to my settings, and it still works. I have no idea how this worked, but it works.