My iphone 4 only vibrates, and does not ring on incoming calls.

My iPhone Won't Ring! Here's The Real Reason Why.

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Jul 19, 2014 - When the phone rings, you're going to hear it. ... Most of the time, the reason an iPhone doesn't ring for incoming calls is that the user .... when i checked back, my sound didnt work. do i need to go to the apple store? thanks.

Things to check if your phone doesn't ring when people call

www.centurylink.com/help/index.php?assetid=220

CenturyLinkThings to check if your phone doesn't ring when people call. Your friends and family tell you they try to call and either it just rings and rings or maybe they hear a ...

Volume buttons or ringer not working - iPhone 4 - iFixit

https://www.ifixit.com/.../Volume+buttons+or+ringer+not+working

iFixitSo for two weeks now my side volume buttons don't work. When I try to change .....However, the phone doesn't ring when someone calls or texts. The speakers ...

Why doesn't my landline ring? - phone telephone bt ' Ask MetaFilter

ask.metafilter.com/190429/Why-doesnt-my-landline-ring

It could be that your selected ringtone is inaudible. Go into your settings and test the selected ringtone for calls. If you can't hear it, try another. Also check your ringer volume setting. It may be all the way down.

Strange. I would try resetting your iPhone. Hold down the home and power buttons until it powers off. It should start up automatically but if not just press the power button. This has worked for me in the past when my iPhone has acted strangely.
Don't worry about a reset or hard reboot. You won't lose any data or settings.

If you're missing incoming phone calls due to your iPhone not ringing, you may have accidentally switched the ringer to vibrate or silent, according to Apple. The switch on the left side of the iPhone turns off the ringer and usually sets your phone to vibrate mode, but if your iPhone's vibrate setting is also disabled the phone will instead be set to silent mode. When in the phone's sound settings vibrate mode can be enabled, and the ringer volume of your phone is adjustable.

Read more: My iPhone Will Not Ring ' eHow.com http://www.ehow.com/how_7384812_iphone-not-ring.html#ixzz22OJOMZGR

Dear Dburnett412.

If you can't hear the ringer when there is an incoming call to your iPhone 3G, you may have overlooked whether or not the ring/silent switch is set to silence the ringer. The ring/silent switch is above the volume switch. If you can see orange on this switch, it's set to vibrate. Switch it to ring and you should be all good.
If this doesn't help, you may want to consider resetting the iPhone.

Follow the below instructions and you can remove the vibrate state. I have included a link to download the phone's manual as a PDF file.

Sound Settings
Ringer Types
Ringer types help you identify incoming calls and messages.
You can assign ringer types to individual Contacts entries,
types of calls, and types of messages.
Downloaded Ringers can be downloaded right to your
phone.
Preprogrammed Ringers include a variety of standard
ringer types and familiar music.
Vibrating Ringer alerts you to calls or messages without
disturbing others.
Selecting Ringer Types for Voice Calls
Your phone provides a variety of ringer options that allow you
to customize your ring and volume settings. These options
allow you to identify incoming calls by the ring.
To select a ringer type for voice calls:
1. Select Menu > Settings > Sounds > Ringer Type >
Voice Calls.
2. Select With Caller ID or No Caller ID.


http://downloadcenter.samsung.com/content/UM/200708/20070824101259031_sprint_m300_ug.pdf

Found on Motorola Support:

1. Make sure that the "Smart Profile: Face Down" feature is enabled.
2. Hold the phone face up in your palm.
3. Call your Droid X from another phone.
4. As the phone is vibrating, DO NOT ANSWER.
5. Still holding the phone, flip the phone face down as it vibrates.
6. Still holding it face down, hit your volume key to silence the phone.
7. Flip the phone back over so it's face up. You should feel a quick vibrating jolt indicating the ringer is back on.
8. End the call. It shouldn't matter which phone you end the call from, as feeling the jolt is the key.
9. Leave phone face up and call yourself again. If the ringer is now working again, turn OFF "Smart Profile: Face Down" until there's a true fix.
10. If it does not work initially, try all of the steps again a few more times and hope you get lucky.

firstly read the operations manual for that phone look on how to adjust the settings of your phone it probably sure was indicated there, because the way i see from what you posted it has no internal circuitry prob. it just needed an adjustment.. hope this advice helps... ;-)