Go to Saipan mobile phone software forum, register your account and log in to the forum. Then find the section of your mobile phone model. Then, when the mobile phone is on standby, enter a string of symbols *#06# and write them down with notes. Send it up. Remember which floor you are on. When posting, they will give you a proof in a few days. When the certificate is ready, download it to your own computer or install it on your mobile phone. Then you have a certificate.