Javad The seller should provide you with a report from checkmend www.checkmend.com to show that the phone is not currently listed anywhere. Don't accept a phone that has anything other than all green indicators.
Once you have the phone, put a SIM in it an make some calls, so that your operator has a record of the phone being used on your account. If the phone is subsequently blocked that contact your operator, they will be able to see which network blocked it and get them to list the block. If they have records of the phone being used on a legitimate account (Your SIM) then they can get the other operator to lift the block. Only operators have access to the blacklisting process, once an operator blacklists a IMEI on their network they then post this number to a central database and all other operators pick this up for blacklisting. So if your phone is stolen and you report it to your operator, you can be assured that it is listed at least with all UK operators. Only the operator that listed a IMEI is capable of lifting the listing. If your IMEI has been listed by another operator (yes mistakes happen) then the listing indicates the operator that listed it so your operator can get the problem resolved. Provided they can show usage on their network with a valid account this should not be a problem. Lastly it is worth listing your IMEI number on IMMOBILISE www.imobilise.com, This one of the places that the police will check if they recover a phone, to see if it has been stolen. The blacklisting processes are managed between the operators in a forum known as MICAF www.micaf.co.uk There are some useful tips and contacts on their site. You cant contact micaf directly, you need to go through your operator. Stuart -- Stuart Ward M +44 7782325143 -- ubuntu-uk@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk https://wiki.ubuntu.com/UKTeam/