Hello there! If I posted in the wrong spot, please don't delete me! Move me where I'm supposed to go and I will learn.

I live in South Mississippi and although there is coverage mapped in my area, I do not believe it is a native cricket market. I've been unable to confirm this, but as none of the major cities listed in the SID sticky are even in my state, I'm assuming that I'm in an MVNO. My question is...

Can I use an SID from a neighboring city or is there an SID floating out there for me somewhere? I've used a slew of mixed search terms to try and target an SID for my specific area, but I've been unable to find anything definitive. I'm wondering if I can use the SID of Houston or Birmingham which is not very far from where I'm at. I also understand there is a default SID, but I'm not sure what that is either.

Thanks for reading.