In my case, I had to create a new APN. Search for your mobile network provider. This is for voxi vodafone:
Good luck there as did that and spent two hours with support online and getting it back up and lost some stuff and it did nothing to solve the problem... Did you finally get it fixed as mine still not working...
Nope. Although it isn't happening as frequently, it will suddenly and inexplicably not send or receive texts or calls. I've done their fix-all factory reset which made absolutely NO SENSE since it happened right out of the box. SMH. I'd be better off taking a hammer to the screen and getting the store's service plan coverage for a new phone.
Sorry about that as I agree to taking a hammer to the screen as Samsung has a problem they are not dealing with and their support online and by phone is worthless. Spent over two hours yesterday with a full factory reset which was annoying and didn't work. Certainly won't buy another Samsung product as thought they were better than this as this problem goes back a long way and still not dealt with.
Hi I Updated my A8 2018 from Android Oreo to Samsung One UI 3 days ago and since the update my 4g or Mobile Data is not working properly it is showing glitches as I have tried every possible solution. My Sim Card is perfectly OK aNd it is working best on other devices.
Suggest me something