In case, your iPhone is already blacklisted by apple after entering the IMEI number or your Country name in the required to fill space then possibly this is a matter to worry. IMEI is a unique number which isn't allowing the network; even you would have used the new SIM. Actually it is there to keep your cell phone safe from theft. So, in case, you have purchased an already blacklisted iPhone by mistake, then make a report for the seller immediately.
The iPhones are very popular and selling such kinds of blacklisted iPhones is actually a crime. The iPhone would be listed a blacklisted when someone would have stolen that from the store or in case one would have stolen that from somewhere and owner have made it blacklisted. There are quite huge number of ideas to keep removes the blacklisting iPhone issue, but possibly some of them would be highly risky.
Using a premium blacklist checking service to unlock iPhone provides you with brilliant results that are 100% exact about your blacklist iPhone status from the database with the cheapest price, with faster speed and also one can track the order easily as well. This would actually make help to do the Unlock iPhone as you desire for.
In case, you are in search to check iPhone blacklist then there is no need of searching for any free services because possibly they won't be 100% exact. We, unlockingiphone.co.uk being an official checker would offer you with premium checking services to get trusted results for iPhone factory unlock.
You should get check iPhone blacklist with checking the IMEI, before deciding to make any purchase from anyone the reason for the same is that possibly your iPhone can be either lost or stolen or blacklisted already and buying a blacklisted iPhone is not a good idea. This check would help in giving you an idea or better we can say the results of blacklisting information.