All of my earbuds only work on one side?

So I'm trying to use my earbuds and the sound is only coming out of one side. This happens on every set of earbuds I have tried. It affects anything that plugs into the jack. I know it's not a problem with the settings because Bluetooth audio works fine. How do I fix this?
The problem is on an iphone 6s and an iPad Pro

Are you certain that you have pushed the headphone/earbud plugs fully into the sockets on those two devices?

Does it happen with 'buds you've borrowed which are known to be working perfectly?

If not, then you have been clumsy with all the 'buds you own and have broken the wire to one side: that can happen if you're in the habit of winding the cables the same way on all of them and doing it too tightly, or if you've been in the habit of sleeping woth them on and often sleeping on one side, straining the cable to breaking point.

The only other possibility is that by chance you have broken the sockets on both devices.

Either any or all of the above - or your JACK is either dirty or broken. Wooden toothpick, vice SHUT OFF - and see of you can pick and blow the LINT our of the port. Last time leaned my husband's phone, I took out a wad of FELT- it was so compacted - and he is a clean guy! - it was pocket lint that got compacted every single time he plugged in his phone to charge.

Same problem on more than one device, means the EARBUDS have abroken wire. And as stated above - you might be using audio (2-band) earbuds when you for phone, you need 3-band ( third band on plug is for speaking into the phone.)

Are you deaf on one side?

Your apple products are not compatible with standard trs plugs. Use apple 4-conductor plug headphones.

Sometimes they are not pushed all the way in

The jack is broken

Try changing the sound setting to "Stereo." It's probably set to "Mono"

Earbuds are supposed to be plugged into a jack for headphones only. The jack you are trying to use has a connection for the microphone of a headset as well as headphones of same headset. You need an adapter to separate the headphones cable from the microphone cable. Cheap, readily available. Don't get a one to two headphones duplicator--useless.

If you have an Apple iPhone 6 and iPad pro, it is possible that the headphones you are using do not have the Mic, ground, right and left, but just Ground, right and left.
A work around is to plug the headphones half way in. But could be a pain in the but if you need to move around a bit and the cable may come out or get pushed in.