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Today, I Updated my Xperia XA to 7.0 (nougat) and movil data does not World... I Called to my Internet provier and restared movil settings, and anything Works.... is it an update problem? thanks For your help 
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this phone has nougat 7.0 build number 33.3.A.0.131, Xperia XA (F3115) it says warranty valid until 26/2/20 and when i am out of wifi range i can NOT get mobil data, i have 3gb in my plan.
There in no mention of internet or internet settings in settings>more or any of its sub menus.
Hi there. If you can't find anything related to internet or wireless and networks under "more" in settings, ask you operator to send you a configuration sms for internet access.
Thank you Jonas for your invaluable advice aparently that was exactly what i needed to do, am now online again a BIG thank you.
Hi again @StarKing and I'm really glad to hear that you can now access the Internet using mobile data and a big thanks to @Roadrunny76 for helping out!
Have a great weekend both of you! 
I read every suggestion from previous post: from downloading the internet settings to reset network settings to Software Repair and none of these are working for me on this Android 8. It is really annoying. I have an Sony Experia XA1. Any other suggestions?
Hi @Cromwell, welcome to our and I'm sorry to hear about this. 
Have you had the chance to try with a different SIM card in your device? If you can borrow one temporarily from a family member, friend or a colleague! Just remember to download the Internet settings again in case they use a different operator and remember to enable mobile data under Settings > Network and Internet > Data Usage!
Let me know how it goes!
My mobile data has stoped working on my L1 and there is no issues with the sim as i can use the data on other phones
Hi @NMT, sorry to hear about this. 
Have you tried downloading the Internet settings again in your device? You can do so in Settings > More > Internet settings > tap accept and wait for them to be downloaded and installed > reboot your device and see if you are able to access the Internet using mobile data.
Let me know if that helps! 
Thank goodness I saw this post, bought a new Xperia XA1 plus, same issue.
Thanks Jonas!
Finally it works