Measure the range and network signal of the mobile network, for 2G, 3G and 4G networks with a professional tester from Thingsdata and see immediately whether there is sufficient coverage.
The tester shows on which frequency and on which technology the providers are in that area. If you look at a smartphone, it may be that it is currently on 4G, on a completely different frequency and perhaps the network is set up by a different provider than the device will or will have to use later.
With an M2M simcard, only the coverage of that specific provider is measured. Without an M2M simcard, the tester measures all nearby networks and you can immediately see which provider has the strongest network.