Top left side of the phone just below the ringer off/on switch there are two buttons. Top button (+) increases volume; bottom button (-) reduces volume. I think that's pretty much a feature on all iPhones.
The volume can also be changed in Settings > Sounds.
The easiest way to turn up the volume on an iPhone 4s is by using the volume buttons on the left top edge of the phone. The volume buttons are two small circle buttons and the one to turn the volume up is the one on top.
SOURCE: iPhone 4S Issues/Will Not Turn On
Hello, First check to see that your power cord is working to charge your unit. Then remove the battery and let set for 2 mins and then put back into unit. If this doesn't fix then you will have too call cust service or tech support for iphone and work with them. May have too send in too have repaired.
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