AT&T Calypso phone unlock failing - doesn't like the IMEI

The Calypso is an AT&T discounted prepaid phone. It must have 6 months of prepaid service in order to be eligible to be unlocked. If you have been using the phone on postpaid service that does not qualify the phone for unlocking. Since it was a freebie given to you by AT&T you can either pass the phone on to another AT&T customer who can use it and buy your own phone with another Network, or switch to AT&T prepaid for 6 months so that you can meet the qualifications.

Hello there @lindelynn, we're here to assist with your device unlock inquiry.

Please locate the chat message icon in the upper portion of the page and reply in order to check your IMEI.

In the meantime, please gather your account information and meet us in a Direct Message to assist. Also, the following steps will help with the requirements for any unlocked devices:

Thank you for reaching out to the AT&T 

For anyone who may come across this later, customer service was NOT able to unlock the phone either. They have escalated the problem via a case to ?? and I hope to report back on Nov 8th or 9th with a resolution.

For those reading this later, the IMEI is fine. There are apparently additional, behind the scenes, requirements for unlocking that regard a minimum threshold of phone activity and data use. This phone has been connected to a wifi network for most of its 6.5 months of use so it doesn't use much data. It is taken out of the house to be used as a hotspot on occasion and that would be the main data use. Most phone calls are incoming spam. In these 2 regards, it's being used JUST LIKE the first Calypso phone that unlocked without incident in April. I will turn off wifi and make several calls a day to "jiggle the handle" and get it past those unwritten thresholds that are keeping it from being eligible for unlock (although it meets ALL the written requirements). Don't know how often the "data" updates, so a sudden burst of usage may not make a difference...

Regarding it being a "prepaid" phone, why did its identical twin unlock with no issue? I don't think the unlock qualifications changed since late April.

No idea.  And we may never know

A second problem report (case) was "completed" with same result. While 3 different customer support agents really tried to help, the algorithm that approves or denies an unlock request doesn't think this phone has been used enough. I've exercised it more than normal without connecting to wifi for 48 hours (videos, calls, & texts) but it hasn't helped yet. I will continue this strategy for a few more days and try to unlock it every 2 days, but will probably have to give up.

I find it ironic that cell carriers encourage you to use wifi so as not to consume their data, but when you do that well, AT&T thinks your phone isn't being used enough and won't unlock it. 

Final comment: I used the phone heavily for the last 5 days, but it seems to have made no difference.  Still getting this message when I submit an unlock request: 
"Looks like the IMEI number you entered doesn’t match an AT&T device. Try entering it again. Dial *#06# on your mobile phone to make sure you have the right IMEI."
Being as this is a very "light" phone, it's not worth putting forth any more effort to get it unlocked. It *should* qualify for unlocking, and the fact that it doesn't is purely AT&T's fault.

the algorithm that approves or denies an unlock request doesn't think this phone has been used enough. 

6 months on prepaid is required. 

5 days is not going to cut it.