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@User1402 Realistically, I think you'll find it simpler just to get a new SIM with a £10 Big Value Bundle, or apply a Big Value Bundle to one of your present SIMs, and use the phone with that SIM for 30 days, making a number of calls, sending a few texts and using a bit of data. Then, after 30 days, the phone's IMEI will be truly associated with the SIM, Vodafone will have its required proof that you are the regular user of the phone, and they'll be able to request the unlock from Apple.
You might find that Vodafone has already made an association between the phone and one of the present SIMs, but equally you could just waste time trying to get that sorted out, and end up having to buy a £10 BVB and start the 30 days in any case.
If you've had 4 SIMs on the go simultaneously, I'd have thought that you were the one in the driver's seat? In order to make money by buying phones in order to sell them on, it's probably as well to discover the ground rules of the business you want to engage in.
There's a link here for the NUC policy and form:
If you contact the customer services team (or wait on the Tech team here) they should be able to advise you (if you have fully registered a PAYG sim with them and can pass the relevant security checks) when that particular sim was activated/started use with the imei in question. Otherwise it may be a case of taking note of when you start the 30 day period with a new sim card and taking it from there.
Hope this is of some help. :-)
The link gives information about the process.
If you complete the form for the same imei a number of times you are potentially facing an issue with this being flagged up by fraud. I would suggest monitoring one noted sim card within the phone for 30 days and then requesting an unlock as being the easiest process.
Another link, although it gives the same information:
Either use an existing SIM, or get a fresh one, but you'll need some credit or a bundle on it, so that you can make chargeable use of it, and get the phone's IMEI firmly associated with the SIM that you are using. And you really do need to keep using that SIM, rather than doing a whole lot of swapping, or it might not be possible for the system to make the link. (You'll presumably have discovered, when swapping SIMs around, that doing so generates a flag on the Vodafone system and triggers a reminder to check/update your APN.)
There are major fraud issues around getting stolen phones unlocked, and all the networks are careful about this. The current 30-day situation is a relatively recent one, and actually represents something of a relaxation of the previous procedures, but Vodafone really does need to assure itself that the phone is being used in a consistent manner over this period if it is to initiate the unlock procedure.