We went with a Pep Wave system from RV Mobile Internet. It has two slots for data cards we found that the ATT card was the most reliable Verizon was our back up. It also has a roof mounted antenna that does not boost the signal but draws in even weak signals. We would see like two bars on our phone but the pep wave would see 4. My wife ended up working as we traveled across country and it worked very well. If you use it to stream data it does go through your card quicker but still workable. I see that RV Mobile internet now has their own data plan and device. We will be signing up with them next year for our data usage.
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