⟐ Commented 8월 06, 2018 at 23:36 GMT-7

The mute switch isn't on, I've switched it back and forth. I've tried plugging and unplugging headphones into the headphone jack numerous times to see if some debris is in there. Nothing. I've tried cleaning the headphone jack with a cut Q-tip and a little bit of electronics cleaner, still nothing—though the first spin of the Q-tip looked pretty dirty since I've never cleaned it before. (The iPhone is about 1 year old.)

The iPhone 4 will play via headset, Bluetooth, dock connector and via the earpiece for phone calls.

And the weirdest part is that the iPhone 4 speaker WILL playback normally through the speaker when running Voice Memos, Skype or Talkatone apps. And if I move the ringer slider in Sounds prefs it works normally and produces the different levels of ringtones.

The iPhone 4 will also produce keyclicks if I remote-lock the phone via iCloud and press the passcode, which has the keyclick sounds.

Alerts through the speaker don't work for SMS or TextFree. Keyclicks don't normally work via TextFree—but for some reason it worked normally once and even got an SMS alert through the speaker. But after going to Music.app volume control, it disappeared again.

Weird workaround

If I have both Skype and Apple music app going, make a Skype call, put it into speakerphone mode (sounds comes out of the speaker), open the App Dock, switch to Apple Music app and hit play, the volume control remains up and works normally (though the audio is playing over the Skype call's audio).

I'm running an iPhone 4/32GB iOS 5.0.1 on an unbroken iPhone. I've already done a full a restore three times. One of those times I remote-wiped the phone and restored.

UPDATE 12/16/11

Ran it without loading backup after yet another restore (actually two restores) and there are no sounds from the device, which was plain without loading any extra apps onto it. No keyclicks. Once, after a restore, it made the 'hey I'm plugged into power' chirp, but that was it. Of course, after full restore from backup, sound still has the same weird problem as above.

Yes, the Phone app works via speakerphone, and I can control the volume. And like Skype, once this audio channel is open, the Music app can play through the speaker—but as soon as the phone call hangs up, the audio from the speaker for Music app is gone, just like my test with Skype.

It seems like a programming call is routing audio in different ways in the iPhone 4. The app Recorder does not play via the speaker, but maybe it uses the music programming call to go through the speaker instead of the voice one.

The phone is out of warranty, as it was bought a year and a few months ago.

Could this really be a bad headphone jack causing all of this?

⟐ Commented 2월 20, 2018 at 0:15 GMT-7

I have dropped my iPhone 4 last week from my pocket.

The problem is, since that happened, the back section of the iPhone, heats up and gets very hot. The heat is on the right side of the phone (where the rear camera is).

This results in the battery draining VERY fast. With just some casual safari browsing, the battery falls by about 10% - in just 2-3 minutes.

When charging the phone is EXTREMELY hot.

The rear camera, also suffered a shock, and the focus motor does not function any more.

The exterior of the phone stayed perfectly fine, but I fear that there is some sort of short circuiting within the board. (cannot be the battery, as it does not get hot).

Does any body have any idea how to check for short circuiting within the board?

If you have any suggestions please help!

many thanks

Sam

⟐ Commented 10월 17, 2019 at 20:20 GMT-7

Has anyone had a problem like this? Is there anything I can do to resolve it?

⟐ Answer edited 6월 01, 2016 at 12:49 GMT-7

⟐ Edited 6월 03, 2016 at 14:58 GMT-7

Except from the Settings>General>about, And from the Sim card tray - Is there anywhere else where i can see the iPhone's 4 IMEI?

Thanks

⟐ Commented 4월 15, 2016 at 15:38 GMT-7

I am new to this site, but a long time use of the iphone 4 GSM 16GB. I have been using it since launch day in 2010. I have went through 2 devices and 2 sets of batteries. First device I had for 2 years, and had it replaced with my current device at the local apple store under apple care.

The second device, since I use the iphone a lot during my day, I charge it twice daily, even since new. I use the GPS, camera, and surfing a lot. Back in November 2013 I replaced the battery with a "new" one from a shady mobile repair shop. I didn't notice any gains in battery life. I kept using the battery until this month. Because I noticed significant deterioration in battery life.

Therefore I decided to set out on to replace the battery myself using ifixit repair kit.

But before I did, I did my research, and read about li ion batteries and charge cycles. Unfortunately apple doesn't allow us to know the current state of battery unless you jailbreak. I jailbroke my iphone, and installed applications that tell me the battery details.

The battery I had that was only 10 months old had 890 Charge CYCLEs!!! and already lost 30% of its useable capacity, meaning at full charge I was getting only 70% of what the battery originally had in capacity.

This angered me because I paid well over $30 to have it replaced.

I set out on google to read about the quality of ifixit batteries, because people buying batteries from amazon and ebay are having nightmare issues, with batteries failing and having charge cycles over 500.

I couldn't find any information for ifixit batteries. I ordered one anyways.

It came quite fast. I installed it (extremely easy) and ran the battery app.

I am happy to confirm that their battery was actually new, it had 0 charge cycles, and the capacity was showing 99.98% (like 1418 out of the 1420 mAh).

I thought this information might be useful for people who want to make an informed decision regarding iphone battery purchases from this site versus shady mobile repair shops and ebay.

Thanks ifxit!

⟐ Commented 8월 02, 2021 at 22:27 GMT-7

⟐ Commented 5월 20, 2019 at 22:28 GMT-7

⟐ Commented 2월 11, 2018 at 5:30 GMT-7

I am having extreme difficulty freeing the SIM card from my iPhone 4. Bent the Apple SIM Tool in the process. Opened up the back and found that the lever has been dislodged (an empty hole where the pivot is supposed to be at).

Tried pulling it out with a makeshift paperclip hook but it hasn't budged even after applying enough force to cut my fingers off.

I'm comfortable with disassembling the %#*@ thing but the logic board cannot be removed with the SIM tray in place. Seems like a catch 22. Any advice please, guys?

⟐ Answered 4월 14, 2018 at 13:19 GMT-7

I am confused on what mic I may need to replace. The top or bottom. Or if its could be something other than a mic that is the issue.

⟐ Answered 11월 16, 2015 at 16:41 GMT-7

⟐ Edited 9월 26, 2016 at 9:46 GMT-7

⟐ Answered 5월 12, 2024 at 13:43 GMT-7

Thank you!

⟐ Answered 12월 15, 2018 at 14:50 GMT-7

How can I fix it?

⟐ Answered 5월 12, 2018 at 9:19 GMT-7

⟐ Answered 9월 18, 2024 at 18:00 GMT-7

I hope someone can help me I have an iPhone 4 I recently purchased as spares or repair.

It is stuck in DFU mode but when I try to restore it I get this

the iphone iphone could not be restored. an unknown error occurred (2).

I have tried all sorts to get round it it's supposed to be an issue with antivirus but I don't have any antivirus as I only use Mac.

I've tried on both my iMac & my MacBook Air neither of which have antivirus or any firewall set up.

Interestingly on the iMac I get a different error code I get error 21.

Problem with the iMac is I use it as a server in my workshop so it has a lot of drives & devices plugged into the FireWire & USB ports to unhook it all would be a pain.

But the MacBook Air has nothing plugged into USB except of course for the iPhone.

Other things I have tried iReb I have also removed the logic board from the iPhone & hooked a battery with a dock port to it & tried the restore that way no joy same error code.

Anyone maned a workaround or found a way past this?

Thanks guys

⟐ Answered 8월 21, 2016 at 6:16 GMT-7

⟐ Answered 3월 31, 2018 at 6:00 GMT-7

⟐ Commented 7월 03, 2021 at 0:15 GMT-7

I'm thinking that I will try to clean up this corrosion before trying to plug it in again, but I'm not sure what sort of tool to use. Are we talking isopropyl alcohol and a Qtip, or is there some other accepted approach?

⟐ Commented 3월 29, 2026 at 16:25 GMT-7