iphone 4s can not increase the volume button only by headphones help me

Hello Will,

Thank you for the details of the issue you are experiencing with sound on your iPhone. It sounds like you are seeing a screen similar to this when trying to adjust the volume:

I recommend the following steps for an issue like this (you can skip any of the steps you have already taken):

1. Verify that the volume is set to a level you would normally be able to hear.
2. Ensure that there is nothing plugged in to the headset jack or the dock connector.
3. If the iPhone is in a protective case, make sure that the speaker port isn't blocked by the case.
4. Make sure that the speaker and dock port aren't clogged with debris. If necessary, clean it with a clean, small, dry, soft-bristled brush. Carefully and gently brush away any debris.
5. If an audio issue occurs when using a specific application, try testing other applications to see if the issue persists.
6. If the iPhone is paired with a Bluetooth headset or car kit:
   • Try turning off Bluetooth.
   • If you experience difficulties with the Bluetooth feature, followthese troubleshooting steps.
7. Restart the iPhone.
8. If restarting doesn't fix the issue, ensure that your iPhone is updated to the latest version of iOS.
9. If the issue is not resolved after restoring the iPhone software, please contact Apple Support.

You can find the full article here:

iPhone: No sound or distorted sound from speaker

http://support.apple.com/kb/ts5180

Thank you for using Apple Support Communities.

Best,

Sheila M.

I've been having this problem off and on for months. (My iPhone 4s is 18 months old.)

This is a well-known problem with the iPhone 4S. While the suggestions posted by sheila_m sometimes do work, I've found that there is no permanent fix. The problem comes and goes seemingly by itself. Some people have had their entire iPhone 4s replaced multiple times for this issue, only to have the same problem come back.

Here's a suggestion which might work. Try using various applications which utilize the volume buttons. Turn the volume up/down while using said applications. The last time I placed a phone call on speaker, the problem went away. It might have just been a coincidence, but who knows for sure?!!