How to set 4G for SIM card?

[paulakreuzer]

Here is a neat collection of settings you should check:

No internet access via mobile data after update to Android 6.0

You have to check multiple locations in the “Settings” menu: Settings → Wireless & Neworks → SIM cards → Preferred SIM for → Cellular Data Settings → Wireless & Networks → Data usage → [select SIM] → Cellular data (Should only affect Internet speed and not whether you get an Internet connection at all) Settings → Wireless & Networks → More → Cellular networks → [select SIM card] → Preferred network type (If this is greyed out, put the other SIM card to 2G before.) Settings → Wireless & Network…