Antenna design
The antenna design of iPhone seems to be less extreme than other mobile phone brands. Antenna is the key to receive and send mobile phone signals, and its design directly affects the quality of signals.
Baseband chip
IPhone once chose Intel as the supplier of its baseband chip. Although Intel's chips may be slightly inferior to competitors in performance, since iPhone 12, Apple has turned to Qualcomm, and the signal problem has been improved.
Software problem
Some glitches in the iOS system may affect the reception and transmission of signals. But don't worry, Apple will always solve these problems through software updates in the first place.
Operator influence
Different operators may have different signal coverage and signal quality. This may be why in some areas or under certain conditions, you will feel that the signal of iPhone is not satisfactory.
Battery strategy
Apple may pay more attention to battery life when designing mobile phones, at the expense of signal strength to some extent. This means that in some cases, in order to save energy, iPhone may choose to sacrifice some signal performance.