Trying to look up comps/sold with no wifi/cell service?

Just curious what y'all do when you're at a sale and have limited data or even almost no service?

I was at an estate sale Friday and found some books but wasn't able to pull anything up on Google Eye due to having less than 1 bar in the basement of an older house. Took a photo of the books I was in, went up to the 2nd/3rd floor and was able to pull them up that way, but made me feel a little uneasy knowing someone could have swiped them under me.

Granted the books weren't priced yet as they kind of took their time with it. Do you guys hang on to your stuff and then dump it if it's not priced or pretend to go look around the sale until you get service?