Leo says that ZTE has been banned in the United States, and that greatly affects Huawei products. It's a pity too because the latest cameras on the Huawei P20 phone has been designed by Leica, and they create amazing images. DXoMark says it's the best cell phone camera they have ever seen. Even the front facing camera is impressive with a 25MP sensor.
Mike bought a Huawei G8 mobile phone in Hong Kong that is a dual SIM model, but it only runs on the G2 band in the US, even though it's on G4 in Hong Kong. Leo says that it wasn't designed for the US market and as such, it only supports certain bands here. He may not have much of a choice. One thing he can try is going over to the XDA Developer Forums. He may be able to root the device and gain access to those bands. He should enter the exact model of the phone to find out how to do it.
Sam wants to buy an unlocked smartphone. He's heard Leo talk about the Motorola Moto G, but he's also looking at the Huawei P8 lite, and the Alcatel Idol 3. Leo says that the benefit of owning an unlocked phone is that he can take it to just about any carrier. It gives him flexibility, but it also means he'll have to pay for the phone completely up front.