The Vanishing Bees in some parts

30 years ago bees were pesky and was everywhere in the Philippines. Nowadays specially in the cities. You won't run into any of them at all. As if they all vanished. In the countryside though you get to find some and they even have bee farms, that's where we get our honey from. Some parts of north america have lost bees too as you can find some bee farms. But it's not like what they used to. Could it be that our cellular/microwave technology is interfering with the bees' geolocation? What do you guys think?