I am trying to opt out of some ad networks and one has asked for my phone ID.

I have an HTC Evo 4G on the Sprint network, rooted.

I went to Settings> About Phone> Phone Identity, there it lists my Model number, MEID, Phone Number and IMSI.

Can someone please tell me what this acronym is? And you might add MEID too please.

And also, which one would I use to opt out?

Thanks in advance