Nokia Lumia 635: Unrecognized SIM card

You have just bought an Nokia Lumia 635 and when you turn it on, it displays the following error message: SIM card not recognized. Oftentimes the Nokia Lumia 635 does not recognize the SIM card and displays this message. In this case, it is not necessarily important to bring the Nokia Lumia 635 directly back. Certainly, there are several tips to solve this trouble. We will consequently observe in this tuto, what are the stuff to do and check to ensure that the SIM card is recognized on your Nokia Lumia 635.unrecognized-sim-card-Nokia-Lumia-635

What to do when ever the SIM card is not recognized on my Nokia Lumia 635

In cases where the SIM card is not recognized on your Nokia Lumia 635, below is a list of stuff that may help you determine the source of the trouble, observe repairing the trouble.

Clean SIM card

One of the first stuff to do if the SIM card is not recognized on your Nokia Lumia 635 is to clean it up. In fact, it might 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 tracking of the SIM card on your Nokia Lumia 635

Oftentimes the trouble might result from the tracking 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 Nokia Lumia 635 from reading the SIM card. To solve this trouble, you just 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 test it on another phone and you will have your answer. In case it is not recognized on other devices, you can modify the SIM card.

Try another SIM card on your Nokia Lumia 635

In cases where the two previous steps do not give anything, it can be important to test another SIM card to find out if the trouble comes from the card. Certainly, if other SIM card work on the Nokia Lumia 635, 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.

Confirm that your Nokia Lumia 635 is not Simlocker

When you have tried several SIM cards on the Nokia Lumia 635 and non-e are recognized, the smartphone may be Simlocker. It indicates that the Nokia Lumia 635 will recognize just the SIM card of a certain operator. In this case, you have to unlock it. You will find without a hassle a lot of provide on the web that may do that.

Check that the problem will not result from the ROM installed on the Nokia Lumia 635

This part mainly concerns the people who root the Nokia Lumia 635 to install a ROM that is not initial. In cases where this is actually what you have carried out, be aware that the unrecognized SIM card trouble is quite common after setting up new ROMs. We advise that you reinstall an initial ROM and re-test it.

In cases where nothing works

In cases where all the above solutions do not work, we advise you to bring your Nokia Lumia 635 and the SIM card back to 1 of your operator’s shops.