What does bad imei mean?

I want to buy this iPhone for cheap, says it has bad imei for T-Mobile but can be pues off with a few dollars. What does that mean?

Avoid at all cost.

Bad IMEI means it has either been reported lost/stolen or it has been blacklisted due to the previous owner not paying their bill which means it won't work on any network in your country

It is cheap for a reason. As anon said, it is probably stolen.

If you buy it, it will be completely useless to you when you try to activate with your carrier.

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