Increase 3G 4G LTE network signal strength in ZTE MF29 | No external antenna HD

How to boost your MF29 3G 4G LTE network reception quickly and easily without external antennas. Get good signal strength by just pressing ANT Turn on the button on ZTE MF29 without having external antennas. I thought increasing signal strength is never a easy task with out costly external antennas. But by pushing a button, my 4G/LTE signal got boosted even with out having any high gain mimo or yagi lte antenna booster.