iphone 4 constantly dropping calls or "call failed"

the problem is this it could be a iphone 4 problem or it could be a carrier problem I have a iphone 4 and I drop calls all the time depending on where I am but I have been in places with great reception where I dont drop calls so im not so sure its not a carrier problem

its funny you say that apple has blamed at&t for the last 4 years

hello
i have iphone 4 i have tryed everything with it from restoreing it to useing cover and even with handsfree it has also had new simcard to b honest i think apple are cowboys because they have not sorted the problem i am waiting for mines to come back from repair again if its not sorted this time im going to thin k about getting the new blackberrie pearl longer battery life and no drop called crap !!!!!!!!!!!!!!!!!! i think the blackberrie is the way foward??????????

Have you tried to do a settings reset, this helped my phone cause I was having the same problems with my phone.

Settings-General-Reset-Reset All Settings (this will not delete anything)

thanks for the tip but i tried that to it did help speed up the phone but did not help with dropping calls but my phone company called me today to tell me that apple are giving me a new iphone 4 so i shall try this i shall let you know how i get on with it thanks.

Dude, I'm having the same problem: I'm with Telus and I noticed it always happens with the following situation:
- when my call exceeds 5-10 min, I lost audio of the call but the person on the other end can still hear me
- regardless of holding (or not holding) the phone. It could be in my hand or on a surface (eg: couch or table)
- while using the headphones headset (usually with the headset plugged in or even without
- regardless of battery power or being charges
- whether or not it's in a case (it's in a griffn reveal bumpe/protector case)

This has on happened recently and I've had my iPhone for about 2 months now, never once dropped it.
When I try to call the other person back, I get "call failed" but it works normal after 1 or 2 attempts.

I had this happen here also in uk. signal just goes. O2 has answer, switch off 3g and the signal strengh goes right up the scale. It works but then thats why we have ihones.

Hey everyone, I think I finally got the solution for this. It appears to be a NETWORK ISSUE with the phone provider. I am a Telus subscriber and after speaking to a cool tech guy from Calgary named "Corey", he performed the following task:

He told me he had to reset 4 settings on the network for my account. A few of which were under something called "STF viewer" "PLMN" and "PRL"...

Aftewards, I had to go to my iphone: General > Reset > Reset network settings

I am now able to complete phone calls (and apparently my reception sounds better to my call recipients/callers too). The problems is not related to a "faulty device" or "something" you did... If the problem happens again, I'll call my provider and have them investigate the ticket further as it could be a bigger network issue (with GSM) but chances are it just requires a simply settings reset on the backend of your provider's data support team.

After doing the reset, all I had to do was reconfigure my wifi password. No other settings were lost. (and more importantly, I didn't have to re-restore my iphone, didn't have to go to Apple and sound like one of those "iPhone 4 vs HTC cartoon characters" and didn't have to yell like a child to anyone. Just be cool when you call your provider's tech people, these guys are good hard working people and will help you and will have a better chance at success if they empathize with you and don't feel annoyed by you (I'm in IT, I know how it is).

I was also told that if I had to call back and if they had to reinvestigate, the next steps would probably involve having my SIM card changed but based on the previous tech's experience, it would be highly unlikely. I will update you further should I encounter any further issues. Just don't be hating on the iPhone 4 as most people do coz it is a sweet device if you can understand the tech specs behind the underlying issues.

Hope this helps you guys and anyone else who got frustrated by this problem!

Hi everyone,

I'm seeing the same behaviour in Ireland on the Vodafone network, with multiple users. I've since done all the suggested resets and have just received a placement phone today however I got the same behaviour on the first call - very disappointed. I will be changing my SIM card next, but I highly doubt that's the issue.

I have done various testing on this and there is no pattern. Doesn't matter if I'm holding the device or not, inside or outside, city or country, 3G or not, Wifi connected or not, bumper or not. The signal goes from full bars to 1 bar at anytime during a call, resulting in being dropped.

Interestingly, when calling Vodafone to tell them about my problem, they didn't even question it. They sent me a new one straight away without even looking at the first one. This seems to suggest that this particular network is accepting responsibility or may believe it is their fault.

I know other iP4 users on the O2 network in Ireland, and they don't have this issue - further evidence that this might be a network issue where it might be struggling to hold calls on these deveices.

Personally I think it's a device issue. No other device on the market behaves like this. Ericsson, Nokia, Blackberry etc have been making phones for much longer than Apple - I think Apple still have a few more things to learn on the hardware side.

I think we're just unfortunate victim's of Apple's first product failure in an otherwise fantastic product line over the last decade.

I'm having the same problem, called Applecare they offer me exchange, however this is my fourth iphone4, it still drop calls.