Are you trying to insert a new network into a locked mobile? If so, you need to unlock it first. I suggest you can approach Mobile-unlocker.com and specify the country,locked network of Nokia Lumia 521.Based on the availability you can get the permanent unlock service along with free instructions.
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Remove back cover and remove battery and check sim is properly fixed in side sim slot or not. If sim is loose inside sim slot then put some paper packing make it properly fixed also remove sim and rub with cotten lock the golden part of the sim and insert again. Also check the sim in another mobile and if in that mobile sim also not recognized then there is issue with your sim card replace it.
here is how to sim unlock mobile http://mobile-cellphones.blogspot.com/2016/06/android-smartphone-sim-unlocking-details.html
SOURCE: WILL NOT READ SIM CARD
you can try to fold a small peice of paper like 3 times and slide it under the battery, u must use a t6 or t7 screw driver to take apart, but it is a temporary fix
SOURCE: sim card reg failed in my 6630
confirm that your phone is not locked to a particular network carrier especially if you desire to change sim card operator.
if this were so, you will need to unlock your handset first before re-inserting your sim card into your handset.
third way out is to flash your phone.
SOURCE: Sidekick II won't read sim card
Yeah, I can help. On the sidekick 08 when placing the card make sure you place the card with the cut edge facing the battery. This phone work with the sim card facing the opposite way. Hope this help:)
SOURCE: My LG KP500 phone can't read my sim card. But I
My LG Cookie doesnt read ANY SIM card Gonna throw it out D: It ****. Try move your sim card somewher
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