Microsoft Lumia 640 XL

Microsoft Lumia 640 XL

I can't make voice calls - Microsoft Lumia 640 XL

Cause 4 of 9: Your phone is set to connect to 4G networks only

If your phone is set to connect to 4G networks only, it can't find a network if you're in an area with poor or no 4G network coverage.

Solution: Change network mode to allow your phone to connect to both 2G, 3G and 4G networks.

Step 1 of 5

Find "mobile+SIM"

Slide your finger down the display starting from the top edge of your phone.
Press ALL SETTINGS.

Step 2 of 5

Find "mobile+SIM"

Press mobile+SIM.

Step 3 of 5

Select network mode

Press the field below "Highest connection speed".

Step 4 of 5

Select network mode

Press 2G, 3G or 4G.

Step 5 of 5

Return to the home screen

Press the home icon to return to the home screen.

1 Find "mobile+SIM"

Slide your finger down the display starting from the top edge of your phone.
Press ALL SETTINGS.
Press mobile+SIM.

2 Select network mode

Press the field below "Highest connection speed".
Press 2G, 3G or 4G.

3 Return to the home screen

Press the home icon to return to the home screen.

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