Registration failed(13) prompts in Samsung Galaxy S - what does it mean?

Hi everyone. Bought a new and supposed to be unlocked Samsung Galaxy S GT-I9000 from Hong Kong (firmware 2.3.4, kernel 2.6.35.7). got a new pre-paid sim card from Bell (I live in Canada). Every time I switch the phone on the prompt "Registration failed(13)" pops up. Interestingly, with my German pre-paid o2 card it works but of course am I am in roaming in this case.

I asked a guy in a Bell Store and they found in Application>Settings>About phone>Status>Network that it reads "Rogers Wireless". So they thought that my phone is actually locked to Rogers. The seller from Hong Kong claims that all phones are sold unlocked.

My questions are:

Is it really a locked phone?
If so what I can do with it?

Many thanks guys. Looking forward to hear from you. Really need help.

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It sounds like the seller wasn't completely forthcoming with you. If it says it's locked to Rogers, then you can likely use it on a with a Rogers SIM card. You should definitely try it before you commit to a Rogers account though. Likely, depending on how you purchased it, you should demand your money back from whoever you bought the phone from. Although it sounds like you bought it from eBay or somewhere, so any dispute initiation will likely be fruitless.

same problem: s