So fooling around with your families phones for a little while is "testing in detail" no scientist would agree with that, you can not extrapolate conclusive evidence without having tested the devices in many many environments. I highly doubt you were able to take each phone across the country and test the signal and noise levels and how much each area changed in dB levels and record those. I can not believe that you are also able to validate that you are an expert on each devices way of reporting its signal to noise ratio through it's signal indicator bar and how that is coded per device. Finally obviously you cant know what you are talking about since the FCC mandates that all mobile phones and devices with integrated radio transmitter/receivers must have their antennas at the farthest point from the users head...meaning that since this was passed all phones have had their antennas at the bottom of the device not the top!
Well I'm not expert but I'm definitely good enough to know how to take a phone apart and how to identify the antenna, it usually has a large sticker on it with the word ANTENNA on it. In most phones it is on the BACK at the TOP. If you don't believe me, take some phones apart and you'll see. I don't know how old this law is, and I don't know in which countries it is valid, but I'm sure that where I live there is no such law. Older phones with external antennas had their antennas at the top as well by the way. That is the closest you can get to someone's head, phone manufacturers never cared about this. The battery is most often at the bottom, so it doesn't give enough space for the antenna, which is usually therefore behind the screen and the electronics. And I don't have to be an expert and I don't need to know anything about phones to tell you that no one in my proximity has ever had dropped calls anywhere except for tunnels and similar places. So I can say that a dozen of "normal" phones, well-known models from the biggest brands have not had such issues. I'm sure I'm not the only one with phones that have no problems. I'm just telling you what I know for sure, this isn't up to debate. I'm saying that the antenna has never been a problem so far on phones, so I don't think it should be a problem on the "most advanced phone in the world". It's like making a car that has bad wheels.