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my iphone 4 have signal but won't make/received call and text

Ive tried everything, restore many times.i also restore it to factory settings., it will work for 2 weeks then it will be back again with its problem.

i have signal but it will stock there then i can't make/received call and text. i tried other phone and call my iphone number, its ringing but

it doesn't appear on my iphone. i cant call either.

thats the other problem., if that's not happen, the other thing is "no service" i have to restart then it will be ok again, that will happen for like

5 times a day, really *****. Before i update my iphone 4, everything is work perfectly fine, but when i upgrade to the latest version,

this things already happen and i really don't know what to do. please help. 😟

iPhone 4, iOS 5.0.1

Posted on Feb 19, 2012 7:00 AM

50 replies

quitin Author

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Feb 20, 2012 10:31 PM in response to Katie_Bug_88

Is there any other clear steps on how to uninstall the firmware? I cant understand the steps, the one you send is for ipod. And what is the step 2? What will i do? Im confuse.l.msorry for the ignorance?. Lol

Feb 20, 2012 11:47 PM in response to quitin

The article came out before 2007.

You need to skip step 2 because that step is for the iPod only.

You want to copy and paste which computer system applies to you in step 3 into your start menu search engine and follow the rest of the steps

After you finish you should follow the DFU Mode link and restore

Feb 21, 2012 4:58 AM in response to Katie_Bug_88

DFU mode is diff with Recovery Mode right? how to get into Recovery Mode? TQ

Feb 21, 2012 7:54 AM in response to cheng tat

Recovery mode automatically installs software and updates firmware

DFU Mode allows the software and installs new firmware.....

Feb 21, 2012 8:50 AM in response to Katie_Bug_88

Hi Katie, "DFU Mode allows the software" mean what??

If I confident with my existing downloaded firmware (IOS 5.0.1 built 9A406) which I believe does not have problem, then can I just directly restore using DFU mode without delete the existing firmware & download a new firmware again?

How to access to Recovery Mode instead of DFU Mode? Is it almost same procedure with accessing into DFU Mode but the difference is DFU mode is releasing the sleep/wake button in black screen before apple logo appears but the Recovery Mode is releasing the sleep/wake button in apple logo screen after the apple logo appears?

Secondly, iphone screen will remain black after accessing DFU mode but in Recovery mode, it will turn into screen with itunes & usb cable pictures appear, right?

Will it be IOS 5.0.1 built (9A406) has bug problem but IOS 5.0.1 built (9A405) no problem? Because my friend's iphone 4 & even 3GS with IOS 5.0.1 built (9A405) so far has no problem. So, If iphone 4 with IOS 5.0.1 built (9A405) really no problem, then maybe Quitin might downgrade toIOS 5.0.1 built (9A405) & see the response.

Tq Katie!!

Feb 21, 2012 8:58 AM in response to quitin

Hi Quitin, what IOS version u having the problem & using now? 5.0.1 (9A406) or 5.0.1 (9A405)?

What version u used before u had all of these problem? IOS 4 or 5? Because last time u mentioned that u do not have these kind of problem before u upgraded to IOS 5, right?

What is the date u bought your iphone 4 in Qatar?

Feb 21, 2012 9:28 AM in response to quitin

You can use the following site to determine the production date, generation, factory & etc:

http://www.chipmunk.nl/klantenservice/applemodel.html

quitin Author

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Feb 21, 2012 2:47 PM in response to cheng tat

I believe im on my ios 4 then upgraded to ios 5.

My friend bought this march 2011.

I checked my serial number that you give, then here is the info

Generation : 4

Production year : 2011

Production week : 8 (february)

Factory : 85 (china)

Machine model : iphone3,1

Then it says : So far 18 hardware problems have been entered for this model.

If you had or have any hardware problems with this machine you can tell them to us. This will over time reveal if particular models have particular problems. Your email address is needed to prevent fake entries but your address will not be shown on our site. Please give a brief desciption of the problem with this machine (max 500 characters):

What does it means? Thay figure out the problem with the hardware with this model? Oh my.... :(

Feb 21, 2012 7:59 PM in response to quitin

No worry Quitin. U just tell them what are ur problems & see what is the responce from them. But don't let them repair or etc first. I believe that is not your hardware issue cause I just bought my 4S on Jan 2012 but also have the same problem with your March 2011 iphone 4 problem. Somemore, u mentioned that before upgrading to IOS 5, u got no problem. There must be something wrong with IOS 5 or IOS 5.0.1.

Anyway, what IOS version u having the problem & using it now? IOS 5 or IOS 5.0.1 (9A406) or 5.0.1 (9A405)? U can check via Setting-General-About-Version.

Feb 21, 2012 9:10 PM in response to cheng tat

If you are not going to delete the firmware file there is no reason to place in recovery mode or DFU Mode

You do as you please

This is the last procedures Apple Support would attempt to resolve the issue before servicing the phone

Perhaps you should go to your carrier and see if there are issues on their end too

Feb 21, 2012 10:39 PM in response to Katie_Bug_88

Ic. Can I just move the firmware folder file to other location in my PC as my backup purpose without deleting it & then download the new firmware?

Actually, previously I don't know there is DFU mode exists (is it DFU mode is in black screen condition?). All the while I restore firmware using Recovery Mode only (is it Recovery Mode is with iTunes & USB cable logo?).

The latest firmware restoration i did previously was using Recovery mode & download a new firmware. Is it DFU mode is better than Recovery mode for this issue solution? If so, I will do it again using DFU mode & delete & download a new firmware again.

Tq Katie

Message was edited by: cheng tat

quitin Author

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Feb 25, 2012 10:47 PM in response to Katie_Bug_88

hello! i am now doing the DFU mode thing., and this will start from the start installing the new firmware and wait for 3hrs. 🙂 i hope this will help to fix my iphone. *crossfinger* 😁

quitin Author

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Feb 26, 2012 5:20 AM in response to Katie_Bug_88

Im done doing the DFU mode. what will i need is to wait a week or 2 weeks to see if it will work. i will keep you posted guys... im really hoping to work for this is my last solution. 😟

quitin Author

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Feb 26, 2012 5:26 PM in response to Katie_Bug_88

Katie, how will i know if i make it right the DFU mode? :)

quitin Author

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Feb 26, 2012 5:27 PM in response to cheng tat

Cheng tat, im on my 5.0.1 (9A405).

my iphone 4 have signal but won't make/received call and text