Hi, I also got the same problem. My XA1 lost the mobile network connection after updating to Android 8.0. I reinitialized my smartphone, reset APN settings and reboot several times, but it dosen't work. Though I did anything I can do, it doesn't solve the problem, but your post hinted to me. I just switched a SIM card to another slot, then it works!! Thaks for your post.
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