I'm guessing, if it's got 4 pads, it's a tiny transformer of some sort (ut it could be a 2-resistor or 2-capacitor pack). But you'd have to contact Huawei with the close-up with the component circled. Even if it's an industry standard part, the manufacturer often has them made with no markings if they're buying in many-thousand lots, so you can't get it anywhere from them. (And if you're in the US, good luck getting anything from a Chinese company at the moment, even if we're talking about a 20 cent part.)