PeplinkCellular Router MAX BR1 Mini Core | High Speed 150Mbps Single Cellular LTE Computer Modem with Gigabit Ethernet WAN, 2x SMA Cellular Antennas | Redundant SIM Slots | Designed for Security

I've personally set up several of those Peplink modems and they work great. They aren't extremely fast but it got the job done. Our sites were somewhat remote so it may have been related to reception, so I'm still giving it 5 stars.The modems are a bit pricey but "you get what you pay for". I tried two others and they weren't good at all, Peplink is awesome though, the functionality is wonderful. They even have a cloud management system and you can see all of the modems in a single pane. You can create policies and apply them to all, can remote access. I'd recommend it.We used T-Mobile for Internet which I found to be the cheapest and easiest to set up. Had a dedicated account manager and she would register our SIM cards and tie them to our account. Could buy SIM cards in bulk online from other sellers. Make sure you get SIM cards that work with 4G though (depending on what the modem supports). Apparently SOME SIM cards only support 5G. I thought this was wrong information at first but I confirmed it with the carrier. That can be a gotcha.The modem does port forwarding too. I used the Peplink MAX BR1 and it was $300-500. Two SIMs for redundancy but works with one. I'd recommend to make sure the reception is good with a site like cell mapper. I actually did test it with a Verizon SIM and it worked fine too.There is a bad review on Amazon but if you look at the review it's because of a license key. But that's for extra features like multi-site VPN which is an optional add-on. For the main stuff you don't need anything extra. You can configure a site-to-site included, but using their VPN is an add-on feature.If you want to use a static IP, make sure the carrier supports it. T-Mobile did but I had to fill some extra form out for them to enable it.