You have just bought an Microsoft Lumia 640 and when you turn it on, it displays the following error text message: SIM card not recognized. At times the Microsoft Lumia 640 does not recognize the SIM card and displays this message. In this circumstance, it is not necessarily important to bring the Microsoft Lumia 640 directly back. In truth, there are several methods to solve this trouble. We will therefore find out in this tuto, what are the stuff to do and confirm in order that the SIM card is recognized on your Microsoft Lumia 640.
How to proceed when the SIM card is not recognized on my Microsoft Lumia 640
If perhaps the SIM card is not recognized on your Microsoft Lumia 640, below is a list of stuff that may help you discover the source of the trouble, find out repairing the trouble.
Clean SIM card
One of the first stuff to do if the SIM card is not recognized on your Microsoft Lumia 640 is to wash it up. In fact, it may happen that dirt partially prevents the contact between the SIM card and the phone. To clean it, pass a small dab of cloth over it and check if it is not damaged.
Check the location of the SIM card on your Microsoft Lumia 640
At times the trouble may result from the location of the SIM card. In fact, it often happens that tiny metal plugs that normally have to come in contact with the SIM card are a little bit relaxed. When this is the case, this prevents the Microsoft Lumia 640 from reading the SIM card. To solve this trouble, you just simply have to thicken the SIM a little by gluing 1 or two pieces of tape at the back.
Test the SIM card on another smartphone
To find out if the trouble comes from the SIM card, you can actually test it on another phone and you will have your answer. When it is not recognized on other devices, you can actually modify the SIM card.
Try another SIM card on your Microsoft Lumia 640
If perhaps the two previous steps do not give anything, it can be important to test another SIM card to find out if perhaps the trouble comes from the card. In truth, if perhaps other SIM card function on the Microsoft Lumia 640, it can be because the trouble comes from the card. Otherwise, it can be at the level of the smartphone that we will have to look.
Verify that your Microsoft Lumia 640 is not Simlocker
When you have tried several SIM cards on the Microsoft Lumia 640 and non-e are recognized, the smartphone could be Simlocker. This implies that the Microsoft Lumia 640 will recognize only the SIM card of a specific operator. In this circumstance, you have to unlock it. You will find without a hassle a lot of offer on the internet that may do that.
Check that the problem doesn’t result from the ROM installed on the Microsoft Lumia 640
This part mainly concerns the people who root the Microsoft Lumia 640 to install a ROM that is not original. If perhaps this is actually what you have completed, be aware that the unrecognized SIM card trouble is quite common after installing new ROMs. We recommend that you reinstall an original ROM and re-test it.
If perhaps nothing functions
If perhaps all the above solutions do not work, we advise you to bring your Microsoft Lumia 640 and the SIM card back to 1 of your operator’s shops.
