You need to call Straight Talk Wireless, ask if you IMEI is locked with them. If you purchased your Phone through them, you are required to have at least 12 months before you can unlock the phone. The same thing is happening with Simple Mobile, TracFone, Net10, etc. They sell unactivated phones off the shelf, these phone IMEI are clean and show now carrier lock until you put a SIM from a different carrier. Then you get an Activation Lock, even if the Carrier on the phone says otherwise. I found out the hard way going through a replacement phone from Apple. The original IMEI gets chained (locked) to the replacement phone, until the Carrier releases it. The sad part is many of these phones were sold below the average retail price, and some unscrupulous sellers are selling them as unlocked and clean. When they are not. They will not appear on blacklists, because blacklisted phones are usually stolen.