Yes this problem kernel/ramdisk relatedHello, i have found this post, searching this issue. I live im spain and i have this problem with my 2 companys, yoigo and movistar. My telephone was bought in china. In spain the people says that they haven't got this problem.
I have done some hard reset and the problem persist. Do someone have any idea?
I dont know other peoples but my issue not this.. i have good 4g in my carrierr or country.. just sometimes h+ not working correctly and losing calls with h+here's the solution, guys, because i was running into the same problem here in the states.
i'll start with the problem : The IMEI that gets shipped with these phones is not recognized by carriers around the world as being 4G capable, for some reason. SO, when you pop in a sim card, and the carrier tries to provision it, the carrier only recognizes that IMEI as being able to do 3G. so, that's what it sends.
The solution can be done a few ways:
1) Call your carrier (or go into the shop) and have them change the registered IMEI for your SIM to be that of a phone that CAN get 4G, or whatever the equivalent in your country is. For example, I was having a mess of a time trying to get mine to work, and had the guy in the shop change the registered IMEI (what they see) to that of a Galaxy S8 (which works here, not sure about where you are). Pop the SIM into the right slot, and it finally worked, after we wrestled with the stupid thing for 45 minutes in shop (and I spent another 30m on the phone with another technician, see below). So, the easiest way to check that is to pop the SIM out of a friend or partner's phone that does have 4G and plop it into your phone, boot it up and check. It did matter on my phone that it had to be in slot 2, for some reason. or at least the one labeled slot 2. I hope you get the picture...
2) Cut down the microSIM from your phone you were using before and just use that, unless you've already deactivated the SIM. There are instructions online. It apparently works too. I won't go into it, but I did cut mine down, but couldn't try the method because my SIM had already been deactivated (long story. I had to spend 30m on the phone with another technician after I left the store yesterday, because it still hadn't gotten 4G on my new nanoSIM, despite changing the IMEI, but that's because the idiot put the card into the wrong slot, and I'm an idiot for not noticing it.)
Any way, hope that helps clear things up.
If OP will solve the issue I can say that their support is very nice, because they have extreme respect to their users. In that case I will buy in future still from them and I will recommend their products to my friends.