If there's no signal it won't matter what brand. Find out before spending ya money
The nice thing about the Reveal/Tactacam's is they will use any available provider. I'm sure some other brands do this.
But there aren't as many places you can find that have zero service from any provider versus dead-spots with just some of the providers.
You don't need a ton of service to just get the pictures, but anytime you want additional communication from the camera (like receiving a video) they aren't nearly as consistent where the reception is poor. If you do put a memory card in them, you can always review videos and pics from the card, as well. I found on some of my locations there were definitely pictures (usually in the middle of a mass of pics) that didn't come through to my phone.
Their customer service is very responsive and they are fun to have out there!