The Lenovo Moto G4 Plus supports four GSM, four UMTS and nine LTE bands (maximum downstream/upstream: 150/50 Mbps). This should cover some places across the world, but there will probably be some blank spaces for frequent travelers. The LTE signal was good in the well-developed metropolitan Vodafone network and we usually still had 3 to 4 bars inside the building.
Included WLAN standards are 802.11 a/b/g/n, so the smartphone also supports the 5 GHz band and fast wireless networks with up to 300 Mbps. The signal quality is good: With a distance of ten meters (~33 ft) to the router (FritzBox 6490) and with three walls in between, only 2 out of 4 bars were indicated, but websites were opened just as quickly as directly next to the router. Another three meters (~10 ft) and another wall dropped the indicator to 1 bar; websites still opened quickly, but a bit slower.