This accessory may not be supported.

Greetings Gil Dawson,

It seems you are getting an alert repeatedly on your iPhone. To help you resolve this I have linked to an article which contains helpful information about the alert you mentioned. While the article is meant for device with charing issues, it does offer some tips that are relevant to you:

If you can’t charge your iPhone, iPad, or iPod touch - Apple Support

If you see an alert

When you plug in your device, you might see one of these alerts:

• “This cable or accessory is not certified and may not work reliably with this iPhone.”
• “This accessory is not supported by this device.”

If you see one of these alerts, unplug your device try and these steps:

1. Look at the connector at the bottom of your device and make sure it’s free of debris, then reconnect the USB cable.
2. If you still see an alert, try a different USB cable or charger.

Get more help

If your device still doesn't charge or you still see an alert after trying the steps above, contact Apple Support.

Thank you for contributing to Apple Support Communities.

Best,

Bobby_D

I have the same problem, and it occurs with all combinations of charging possibilities (Apple supplied vs. aftermarket, different power supplies, USB, etc.), and the phone does not charge when the error is dismissed and the phone left connected. I have replaced the charging port and battery in the phone, but the problem persists. However, when the phone is nearly discharged, ALL of the charging possibilities work, and will completely charge the phone. But once it's nearly charged, removing the plug and reinserting it produces the "may not be supported" error. Very puzzling!

I have replaced the charging port and battery in the phone, but the problem persists.

How did you achieve that ?

A local "gadget guru" who stocks lots of iPhone parts, and who also replaced my cracked screen for $99 OTC. He was sure that the problem had to be either or both of the charging port or battery. Other "solutions" I have seen on other forums blamed the charging port. Didn't work for me!

Now that it's been opened by an unauthorized party, it's completely unsupportable. Sorry. Find a competent 3rd party repair shop or just buy a new phone. Apple won't touch that one any more.

FWIW to anyone who happens to be reading this. I recently started getting this error quite frequently, but only when I was in the car and, oddly, only in the afternoon on the drive home.

I finally narrowed it down to a faulty USB charging device. Seems in the morning, when it was cool, it would work fine. At least long enough to get me to work without noticing. By the time Miller Time ® rolled around, the temperature was high enough to cause it to malfunction. After going through multiple cables thinking the one I had might be bad, and having not experienced the error when charging at night on the nightstand or when connected to my Mac, I bought a new car charger. Works like a charm now.

Again today, I tried every conceivable combination of charging possibilities: Mac to phone with USB (tried three connecting cables, all Apple), car 12V to usb, Apple cables plus one aftermarket; three Apple and two aftermarket transformers with all of these cables. Still same message. Until the battery power reserve dipped below 12%:Now (as usual), EVERYTHING works to charge the iPhone 5s. Maybe the new iOS will solve the problem?

"Apple won't touch that one any more" is no biggie. we're 250 miles from the nearest Apple store and they want $30 to talk to me on the phone; It's out of warranty since December; and I can't do without it for the time needed to turnaround to send back to Apple in any event!

This problem exists with all my Apple charging sources (Mac USB, 0.5A; iPhone, 1.0A; iPad 2.1A).

I'm sorry. What part of "Now that it's been opened by an unauthorized party, it's completely unsupportable." was unclear?

I didn't realize that the "support communities" were deputy Apple police! This problem existed before the "unauthorized party" was involved. Sheesh!

The phone is not user serviceable. These forums are hosted and sponsored by Apple. It doesn't matter when the problem started, the device became unsupportable when it was opened by an unauthorized party.

Find a competent 3rd party repair shop or buy a new phone.

Thanks, Gunny--I hope you get an Apple merit badge for your investigation of my post and protection of this thread from contamination by 'unauthorized parties'!

Try reading the Apple Support Communities Terms of Use some time. You might learn something.

Thanks for the tip. I did read the agreement, but didn't see any language on point. How about straightening me out?