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Go to settings > cellular data > cellular data options > turn off 4G and turn it back on. Another way I use to get my phone on 4G is airplane mode on and off.


There might be a chance that the service provider is enhancing the network due to which their is tempariorly discrepeancy.


Yes - that is absolutely possible. No there aren’t different chips or antennas, but physical damage could alter the antenna length and the chip could be damaged or another frequency leaking which makes reception on the 4G data rate impossible. Without debug logs or a signal tracker or opening the iPhone, you only have empirical testing or trying to erase / ...

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