firmware help please

Hi, I have a samsung s4 9505. as it's a spare I decided to play arOundle with the firmware so I installed the latest stock one. Its now locked to EE. Is there any firmware / Rom that I can install without it being tied to ee. If so , where can I download it from. Do any of you guys have one. I am uk based. I have tried the unlock method that I found on the net. By keying in *#0011# but I can't get the service menu up to change it. I had a insurance claim on my other phone and that give you the choice to use whoever you want. Is there a way of cloning that one and putting it onto my s4. There both S4 9505.



Thanks

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