The Lumia 640 dual SIM from Microsoft as Smartphone lower middle Checkout offers a bit more features than the Lumia beginners series.Whoever Windows Phone may already or may not reflect emphasis on very specific Android apps can do its complete mobile everyday problems with the Lumia 640th If the fastest possible Internet is important, but you should pay attention to the LTE version to buy. For the same model is also available as a (cheaper) with identical facilities UMTS version available. Overall, the performance is compared to other models in the Dual-SIM mobile test just average, with views of the purchase price but ok.
  • Windows Phone 8.1
  • 5.0 "display, 1080 x 720 pixels, 294 ppi
  • 1.2GHz quad-core processor
  • Online from € 112.00
  • Windows Phone 8.1
  • 5.0 "display, 1080 x 720 pixels, 294 ppi
  • 1.2GHz quad-core processor
  • Online from € 156.93


With 5-inch screen and 1080 x 720 pixel resolution can compete with much more expensive mid-range smartphones. The colors are also clear and rich in contrast appears on the display. The viewing angle of the IPS panel is fairly large, with a strong tendency to view faded but. The screen is - unlike in previous cheap Lumia devices - very good fit in the chassis housing. The ratio of the display area to the total size is generally good, the side frame but could be much narrower.
Side of the Lumia 640 Dual SIM in the Test side

Relatively flat, but not ultra-thin: The Lumia 640 Dual SIM test the design and sturdy plastic materials to make a solid overall, but not high-quality impression. The tile background of the user interface can be adapted to request the housing.

The 8,8mm with relatively flat plastic housing provides way represents a significant improvement over older Lumia generations. Thus, the model is in the test well in the hand.

operating system

We have a general over the operating system Windows Phone compiled details. What is fairly new: the digital assistant called Cortana. By "her" you can perform simple voice commands and questions. Who knows Apple's Siri or Google Now, can get a rough picture of the operational mode.
Microsoft Lumia 640 Dual SIM: colors

The Lumia 640 Dual SIM there again in the typical Microsoft, bright colors - but also in plain black.

The kind of "conversation" has impressed us in the Lumia 640 Dual SIM Test. Because there are not only understood individual commands and not just reeled simple information, but in a limited framework can be even longer dialogues lead, where Cortana detects already amazingly well from the information previously mentioned, what is meant in the later stages with specific demands. The assistant also reminds you of appointments or provides information on traffic jams or weather.You can also restrict Cortana "knowledge" but, if you otherwise get the feeling she knew too much about oneself. A vote "Is Windows Phone better or worse than Android / iOS / BlackBerry?" We can not give - it is partly a matter of taste, but qualitatively the operating system of the Lumia 640 is definitely ideal for normal mobile requirements. However, a criterion in the decision could be the number of apps.Furthermore, one can say that are available for Android and iOS each well above 1 million, while Windows Phone currently kommt.Office on some 300,000 Apps A clear sign that the manufacturer of the Lumia 640 Microsoft is the official office software package "Microsoft Office" is already pre-installed when buying. This can be opened directly on the mobile display the typical Word documents, Excel files, or PowerPoint presentations, view, edit and save. Just dual SIM phones are indeed often purchased to combine a company number and a private number. Since it lends itself to possibly, work on the road in the cafe to do on your phone, on the train or in the office meeting.

Mobile Internet

Those who value fast browsing, streaming, etc., do not want to miss LTE today. Then is important to pay attention to the exact model. Because the Lumia 640 Dual is available both with and without these latest transmission standard. A point which one it will be happy to see: Even the own cell phone contract has to play along. LTE uses only a little, if the tariff of the SIM card that also supports and a very high maximum Mbit / s-rate offers.
Very strange: usually we indicate if a cell phone does not support all 4G frequencies. The 640 Dual SIM is this problem - but is not strangely at all German UMTS frequencies. At least, it is with the 1900 MHz 3G band not compatible according to the datasheet. In the test was not to find out which frequency has been used just locally - we had anyway no problems with the 3G use. Possibly lacking the corresponding entry in the mobile phone details and only.
In addition to the mobile via WLAN is also the local internet. The WLAN standards 802.11 b, g and n can be exploited. In the new, faster ac standard but you can not access. Here is noticeable that this Lumia model is very low and a bit longer on the market.

Dual-SIM Control

Like other WIndows Phone models in the test offers the Lumia 640 Dual SIM - both with and without LTE - a very good control of the inserted SIM card. This is mainly due to the live tiles. Because the Phone tile and the SMS-tile can be separately put both SIM1 and SIM2 for the Start Screen. This one has several advantages:
  • Lumia 640 Dual SIM tiles

    Convenient: Separate Phone tiles for SIM1 and SIM2 in Lumia 640 Dual SIM.

    One can see how many calls you have missed separately to SIM1 and SIM2.
  • One can see how many SMS arrived on each individual number.
  • One can directly tap to call (or to ledges) from the home screen, each desired SIM card and only needs to type the destination number.

At the same time accessible to both numbers

Both phones are available in parallel to receive incoming calls and short messages - or to himself another call or to write. While the phone on a map, the other is, however, not be used simultaneously. This "standby" principle can be avoided by Microsoft's "Smart Dual SIM". This need not necessarily be to ensure that you missed an important call on professional SIM1 during a call, for example on a privately used SIM2.For "smart" by the adjustment can be for both SIM cards each "call waiting" and / or "Forward" set.Whether incurred in their mobile tariff for such diversions fees, but you should check beforehand.

More SIM functions

  • Convenient: For individual contacts you can define it in the SIM settings, if you want this call via the same SIM card always.
  • Each SIM can be described with a desired domain name
  • For a data connection it is necessary to select the desired SIM before. However, one can this setting directly through the Status menu (wipe from the top of the screen) change.
  • Each SIM card can be switched off separately


The main camera is 8 megapixels thanks to image resolution for true souvenir photos that you would like to reflect on larger screen or television. Precision, color values and contrast are good. The bezel has problems in low light conditions, otherwise there are no particular criticisms. With autofocus, LED flash and four x digital zoom provides the Lumia provides the basic utility functions. A optical image stabilizer are nowhere.
Almost a joke, however, is the front camera. A mere 0.9 megapixels is the resolution. Anyone who really wants quick time record and post a snapshot, can be satisfied. But for more quality is not enough.And real bestseller offer in Selfiecam even more pixels than the Lumia 640 uses in its rear camera.


The Qualcomm Snapdragon 400 processor is well suited for everyday tasks, but is clearly in the lower middle class. Even the memory meets only basic needs. With 1 GB of RAM, the Lumia 640 has just a quarter of the capacity of the current top smartphones. And the internal memory falls with 8GB compared low from. The most popular apps and simple games are no problem, but when it comes to 3D games or complex computing tasks, you should rather put on other phones - which are quite and look at Microsoft. However, to most markedly higher price.

Technology and mobile Details

property value
Display / Screen size 5.7 inch Super AMOLED display WQHD
resolution 2560 x 1440 pixels, 518 ppi
operating system announced Android 6.0 update to 7.0 ()
main camera 12.0 megapixels
front camera 5 megapixel
SIM 1 Nano SIM
SIM 2 Nano SIM
transmission standards LTE, UMTS, GPRS
Supported frequencies LTE / 4G: 800/1800/2600 MHz UMTS / 3G: 850/900/1900/2100 MHz GSM / 2G: 1900 MHz
processor Octa-Core 2.15 GHz
memory 4 GB of RAM 64 GB of internal memory
sensors Bullets
battery pack 3500 mAh
Dimensions 15.35 x 7.39 x 0.79 cm
weight 169 g

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