Everytime I turn my phone on it says "Please Insert Sim Card" and the sim is already in there. I tried taking it out and putting it back in but it says the same thing.

You could try to remove your sim card.
Install battery and turn on phone without sim card.
Use phone without sim card and do some operations.
This will check if you phone is working correctly.
Turn phone off and install sim card.
Made sure sim card is install correctly.
If this does not work, it could be the sim card is bad.

try taking SIM and battery out placing it back in an powering on.

If you try this and it still does not work you may need a new SIM card. Take it to a local dealer they should have a new SIM they will put your number on it and you will be back in business.

If the new SIM doesn't not work you will now know it is your Phone, which means time for a new one.

good luck

Go to a store, and they will provide you with a new sim card. That's what happened to me. :p

im not sure about this one as i would have to see the phone but i believe that one of the pin receptors to your sim card is damaged or the slot or latch you put your sim card in has come loose some if it is loose try some tape if not then take it to a cellular repair store and get an estimate on how much it will cost to fix it

try taking out both cards and popping the battery on the phone.

Wait a few minutes and then turn the phone on with no card in it.

Turn it back off when it says no card found and insert the newer card and power it back up.

It seemed to keep a memory of the blank card.

Try rigorously cleaning the sim card and phone connections (also battery connections - after reading forums the batteries on V3's are often to blame for their problems) with a cotton bud then leave the phone off without the sim card in it and charge it overnight. Then put in the sim card and turn the phone on. This might help. My V3 often says Insert SIM and it is very annoying so i'm getting rid of it but those methods have worked for me.

Hope this helps

Mowcius

Its possible that the sim card on your phone is not properly placed or the sim card that you own has some problems already.

Try to reinsert your sim card, this time make sure that it is properly placed. If the same happens, try to use a different sim card on your phone. If there are no problems, that means your sim card might be busted already. If the same happens with another sim card, then it is possible that the slot for the sim on your phone is defective or dirty. You may need to have it checked. :)

its the contact of the simcard to the leads. try putting a thin piece of paper over the sim so that there would be pressure on the sim. as always, think of the contact.

i got problem with my phone n-gage,after i turned my n-gage on..itssays "insert sim car"..i already put my sim card inside of it