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Does the iPhone iOS suport A2P-X?
There is no such thing as A2P-X, there is A2DP (a bass response enhancing Bluetooth profile) and APT-X (a licensable codec for Bluetooth which substantially improves all round audio quality). iPhones support the former, but not the latter.
Interestingly Macs support both as do most midrange Android phones and above, so it would see a strategic decision from Apple not to include it in the iPhone (it can be done via a software update) - mostly likely to protect the AirPlay market.
AirPlay is lossless and therefore of higher standard than AptX, but as AirPlay performance causes a delay of 3-5 seconds, is far more expensive to licence and exclusive to Apple it could justifiably be concerned AptX would be 'good enough' that speaker makers would no longer be interested in paying the premiums it charges for AirPlay.
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