Internet only works on WIFI - 4g icons etc disappeared

Hi guys,
I have had a dig around online and can't seem to find a solution to my problem. My Sony Experia Z3 Compact had been working fine (probably for around 5 months) until recently. For some reason I can only access the Internet if I connect to WIFI - I don't get any 3g/4g etc icons at the top of the phone anymore say when I'm outside of WIFI. This problem has only just occured but it has been about two weeks now and it hasn't sorted itself out... I am fairly tech smart and have looked at all the obvious places in the Settings but can't seem to sort it.
I did master reset my phone about 3 weeks ago (because it was being a bit slow / got annoyed and overreacted ha) but everything seemed fine after that (I think) and it has just suddenly started to play up on the Internet. The phone seems absolutely fine except for this one issue. I would just accept the problem because I normally use WIFI but having 4g sometimes can be a lifesaver so think its needed! ha
Any help would be greatly appreciated.
Thanks
J
Solved!
Go to Solution.

Hi,
I have the same problem on my SONY Xperia Z3 Dual:
No mobile internet when disabling WIFI or exiting a WIFI zone. However, the mobile internet works when I start the phone with WIFI disabled.
I tried the following without success:
1) resend and installed configuration SMS for Internet, MMS, and WAP settings from my mobile service provider.
2) downloaded the Internetsettings as suggested above. I was asked for which net provider I want to download the Internetsettings, and chose the general net of my service provider)
Can you help?
Many thanks in advance.

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