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 need a running gps watch/gadget with MP3 playback?

Any recommendations on a watch or mp3 player that has gps? I used to run with my iphone so I could track my run and listen to music, but now I got the note 3 and it would just be absurd to run with such a large device (but it is great for nearly everything else). Price isn''t a big deal as long as it is quality, but I don't want to carry multiple devices (i.e.watch and mp3 player). I've seen the motoactv but apparently its discontinued and I don't want a device that's going to lose support anytime soon.

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I have a 8 GB iPhone 4 and I wanted to download iOS 7 but I didn't have enough space so I deleted all my music all my texts all my apps and all my pictures and all my emails but I still don't have enough room it says what can I do to get more room!

What's the difference between iphone 4s and iphone 5c?

I'm willing to buy iphone 5c in india after its launch in market
but i find most of its features to be similar to iphone 4s
please tell me the real difference between these two phones
and what will be h\the price it might be offered in market

I have a piece of rice stuck in my iphone 5 charger port

How do I get it out. I don't want to break something in there. The reason there's rice is because I dropped my phone in the tiniest bit of water and it messed up the speaker. They sounded terrible. But thankfully in some amazing way the rice fixed it and not it sound perfect. But I can't charge my phone bc of the rice, the charger won't even go in.

Is it time for a new battery for my iPhone 4S?

Just got a second hand iPhone 4S with iOS 7 I had iOS 7 on my last one which I lost anyway to the point I'm talking 1-2% every minute or 2 my brightness is down, location services are off, Bluetooth off etc 3G is ON although before I could easily get 7-8 hours on 3G I'll be lucky if I get 4 on this using it a lot, should I get a new battery?

**Also the other day it cut out at 20% a few times though it's going down to 1% now**