Hej everyone,
First I apologize if this post does not belong here but my issue appeared as I was upgrading my firmware so I thought it could be a good place. Long text, sorry, just go to the end if you don’t feel like reading.
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Last WE I bought a second hand jailbreaked iPhone. Before buying it I tested it with my SIM card and everything looked fine, I checked that the IMEI of the phone was matching the one at the back of the phone’s box (which was showing 3GS 16Gb). Everything seemed ok.
Then back home when I was happily in the process of setting up my phone, configuring emails and uploading music, iTunes displayed this message that I don’t have the latest version of iOS and I could upgrade. Without thinking I pressed “Upgrade” and then things started getting wrong. The upgrade failed and I could not restore the iPhone, was getting error 1015 continuously (I have actually another post on this forum, but this is for a different problem). I tried all kind of stuff but nothing was working. When using whatever custom firmware for 3GS in DFU mode (using redsn0w) I would still get that the firmware is not compatible. Anyway, I tried one last thing; installed iTunes 9.2 (was using 10.1 before) and tried yet another restored. Still got error 1015 but then after exiting recovery mode with RecBoot it actually restarted properly!!!
But after some time using it I realized that this phone actually had the 3G iOS installed on it instead of the 3GS. Moreover it was only displaying 6,7Gb memory capacity in “Settings->General->About” and in iTunes. So it felt I was left with a 3G 8Gb when I thought I had bought a 3GS 16Gb. The strangest being that the back of the phone actually shows 16Gb. And now when I look at the phone’s IMEI number in “Settings->General->About” it is not the same anymore as the one on the phone’s box

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My questions:
- Is it possible to make a 3G 8Gb entirely look like a 3GS 16Gb, even replacing the shell of the phone and changing the IMEI number.
- Or could I have done something wrong and installed a 3G iOS on a 3GS phone?
I am seeing the person who sold me the phone tonight to get my money back but would appreciate any insight in the meantime.