Is there a cellphone lot while waiting for arriving flights? Specifically a Southwest flight..

No there isnt but u can wait at the credit union right off Archibald as opposed to paying for temporary parking

Yes there is, but the signs are actually wrong. It tells you to go straight when the rental cars are to your left (after you turn on the road from the light). However, you will actually make a right past the stop sign (where the LNG sign is really the only visible sign). Maybe there's a small sign somewhere for cell phone after that stop sign, but it's easier to simply know the above. I've seen many people pass it up and make a go around the whole rental lot.

Yup

Yes and they do . Very visible

Yes, follow the signs.

Yes. You will see the signs for it.