Does the iPhone 5 lock its self to the first sim card installed ?

I bought an iPhone 5 , and the first sim i put in was a 02 sim card , that credit lasted about 20 days then i put in a giff gaff sim card , i have had this for a while now , i have now got a PAYG ee sim  but it tells me that the sim is not valid and i should try with a different sim , i tried with a three sim and it said the same , it said something about an activation process ...  Please help , does the iPhone need unlocking ?

Where did you purchasd the phone? iPhones sold at the Apple store and purchased unlocked are unlocked. If you purchase at another location, they will be carrier locked. I have read phones purchased at Carphone Warehouse lock to the first SIM installed.
What happens if you try to put in another 02 SIM, does it work? If the phone is locked, you will have to contact the carrier it is locked with to see if they offer unlocking services and if you qualify. Only the carrier the phone is locked to can authorize the unlock.

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