Which carrier is my iphone locked to after an unofficial modification?

I have an iphone4 8G, was locked to Fido(Canadian carrier) initially.
I need it to work with Rogers(another Canadian carrier) so I went to a mobile store to unlock it.
The store didn't have a code to unlock Fido, but instead he had a code to change the carrier from Fido to Rogers, I don't know exactly how he did it, but the result is that my phone is locked to Rogers now. The memory had also been expanded from 8G to 16G.

My question is, now I need to unlock it completely to use it overseas.
When I'm looking for unlocking services online, I need to be sure which carrier my iphone is locked to, in order to purchase the service. I consulted an ebay seller, but he wouldn't tell me unless I pay an extra service fee. If I purchase the code for the wrong carrier, the unlock will fail and I won't get any refund.

I hope I explained clearly, my iphone4 is now 16G and only works with Rogers sim card, but the IMEI number still says it's an 8G locked iphone4.

I thank you in advance for your help!

I suggest to know the lock/unlock status of an iPhone 4 contact the customer support of Classicunlocking.com and get the necessary info about whether your iPhone is locked and to which network it is locked to… They also provide permanent unlock solution through their remote unlock service.

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