It isnt just iphone 7. If your iphone says this accessory may not be supported when you charge it it could be something wrong with your charger not the lightning cable.

Lightning To 3 5mm Audio Charge 2 In 1 Iphone Adapter
Iphone 7 headphone adapter not supported. Still love my iphone. Try disconnecting and reconnecting the accessory. I have iphone 6s. If it continues to appear check the connectors on the accessory and your device for damage or debris. Dismiss the error message when iphone says this accessory may not be supported and turn on airplane mode then turn off your iphone. Turn off your iphone and wait for 1 minute and turn it on again.
For that first of all you are required to connect your device to the charger and power adapter to the source. Like method 3 try cleaning out the lint or debris. I never had this problem until 742018 using same headphone and non apple charging corded and plugs. I will contact apple direct. Headphones adapter for iphone 35mm audio cable dongle jack splitter aux cord for phone headphone chargecar charger compatible with iphone 77p88pxxs maxxr11se support all ios. Typically software updates do not cause cables to stop working though four years ago during the launch of ios 7 several third party cables did cause the unsupported device error to occur due to higher standards on lightning cables placed by apple.
Disconnect and reconnect the accessory to see if the alert goes away. Often a simple restart or reset forced restart does the trick. Connect your iphone to the charger. Restart iphone 2 minutes later and turn off airplane mode. If you connect to your accessory using a third party cable or adapter it may be the cableadapter thats the problem and not the actual accessory like speaker or headphones restart or reset. It started after last ios update.
41 out of 5 stars 28. If necessary gently remove the debris and clean the connectors on your device. I tried the suggested fix and it worked for several hours and then came back. So in order to resolve the issue of the accessory may not be supported error message here is a quick trick that you can follow. When you get the error message press with pressure and hold your finger on dismiss button and pull the charger out. To restart power your device off wait 30 seconds and power it back on.
If you see this alert and dont have any accessories connected contact apple support.
Gallery of Iphone 7 Headphone Adapter Not Supported

