Solution for Qualcomm 4G SIM card not able to connect internet
1 First confirm the country and the supplier of the SIM card. Please check the "msm8953_global 4G_3G band distribution" document, whether it is within the scope of network supported.
2 whether the Android machine recognizes the SIM card when Insert ing it into the head unit. if there is mobile phone signal shown on the top, it indicates that the SIM card has been recognized, please take a photo as shown below.
3 Go to settings, "about phone" options, "SIM status", please take a photo as shown below
4. Go to settings, network settings, see if the switch is open, as shown below
5. Go to settings, network settings, take a photo as shown below