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Hi,looks like your phone doesnt recognize your sim card 1-your phone is locked by a sim card company and didnt recognize the other sim services(if so, use the same sim card that buy the phone in first day .for example you buy a locked phone from at&t so u just can use the at&t sim cards not others) 2-try another sim card to make sure your device is all right (unless if it is unlocked phone) 3-reset your phone to factory or hardware reset to check your software is working properly 4-may be you have problem with sim card protector IC that contains zener diode inside to protect your sim card from ESD( electro static discharge) if so go to certified repair shop to check and repair it for you kind regards
I would suspect the mainboard of your pda at first. But for the begining you should try to clean the contacts of your sim slot and check to see if all of them connect properly to the sim card. If all of them do connect properly, my second gues would be that the pda doesn't power on the sim card. Like memory cards sim's need to be powered first in order to work. Most pda that have this problem fail to initialise a sim because they can't suply the 3.3 or 2.7 volts needed due to a hardware mailfunction. However this test should be runned by a service center, they will have to dissasemble your pda in order to check these.
In your case, you can make a hard reset and check the sim card pins in the pda. If this doesn't help, you will need service assistance.
I'm sorry for not being able to help further. Good luck.