Microsoft Lumia 640

Microsoft Lumia 640 Guide

The Basics

Troubleshooting

I can't make voice calls

Possible causes

Turn off fixed dialing.

Step of :

Little or no network coverage

Try again later when you're in an area with better network coverage.

View our network coverage map.

There's an error at the receiving end

Try calling another number. If you can call another number, the error is probably at the receiving end.

There may be a temporary network problem

Try again later or when you're in a different area.

Your number has been suspended due to non-payment

Contact our customer service to have your number reactivated.

You're abroad and roaming isn't included in your rate plan

Contact our customer service to activate roaming in your rate plan.

Turn on automatic network selection.

Step of :

Turn off flight mode.

Step of :

No credit on your prepaid card

See how to top up your prepaid card.

We are pleased that your problem was solved.
Unfortunately, we can't solve the problem with your phone. Contact our customer service for more help.

Specs

Dimensions (LxWxH) 141.3 x 72.2 x 8.8 mm
Weight 145 g
Colour display 16 million colours
Resolution 720 x 1280 pixels
Touch screen Yes
Talk time Up to 26.5 hours
Stand-by time Up to 36 days
Phone memory 1 GB RAM, 8 GB storage
Memory card slot Yes
SIM type Micro SIM
GSM 850 MHz Yes
GSM 900 MHz Yes
GSM 1800 MHz Yes
GSM 1900 MHz Yes
GPRS Yes
EDGE (EGPRS) Yes
3G (UMTS) Yes
HSDPA (3.5G) Yes
4G (LTE) Yes
SMS Yes
MMS Yes
Chat Yes
Email Yes
Camera 8 megapixels
Video player Yes
Video recorder Yes
Video call No
Music player Yes
Radio Yes
Podcasts Yes
Voice recorder Yes
Internal GPS Yes
Maps/Navigation HERE Maps
Calendar Yes
Tasks No
Notes Yes
Alarm Yes
Stopwatch Yes
Countdown timer Yes
Calculator Yes
Office applications Office
Browser Yes
RSS reader No
Wi-Fi Yes
USB data cable Yes
Bluetooth Yes
Data modem No
Synchronisation with computer Yes
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