IPHONE 4s call failed??!!!

I have exactly the same issue, but not so many failed calls as others I read about. Iphone 4S 64GB running ios 5.0.1(9A405). Network provider is Telenor Norway. I make around 50 phone calls in a week and get 2-3 failed. Phone is loosing coverage for 5 seconds, but this is not a operator issue. My ipad 2 running the same software on the provider doesnt loose coverage when this occurre.

No - it didn't work. After the initial 9A406 update (i.e. when I also restored from my existing backup) I could go for 3-4 days without a SIM failure and then suddenly have one happen three times in 24 hours. So I am not yet saying that upgrading without restoring my backup has worked because I need to give it a week to know for sure.

Some people have reported that SIM Failure occurs when charging if the phone runs hot. However, I have had SIM failures when on a charger but also when the phone was not on a charger and just lying on a table.

Alas, no need to wait a week. This morning I awoke to find another SIM Failure message. So, for the record, updating to build 9A406 does NOT resolve the issue (clean install or restore from backup - no difference).

Apple, please, please, please come out with iOS 5.0.2 or something that helps!

As has ben written numerous times, the only remedy it's IOS beta 3. Or as some dreamers say: wait until an oficial update to 5.1 comes (I wonder if this is acceptable for such a reputable company). Meanwhile you can amuse yourself reading all those replies that sound so dreamy!

I also upgraded to 9A406 and I still get Call Failed as well as the problem of no outgoing audio on some calls. Some have written that immediately after the upgrade all seemed to work OK for a while, but that is probably just because the phone was rebooted - restarting the phone always seems to fix the problem for a while.

The problem definitely occurs more when I am in an area with poorer reception.

Also, I always have WiFi turned on but I see the problem more when I'm actually connected to a WiFi network.

I looked at my iPhone's system log and saw messages indicating that the Provider Bundle read from the SIM card for my network (Orange) was invalid or missing. I wonder if this could be related to the problem? My SIM card is almost 4 years old and I've not yet tried to get a new one (inconvenient to get to Orange, and it will cost me about $30). I wonder if a new SIM card will have some provider-specific data on it that affects the phone's interaction with the network?

When I bought my iPhone, I took my old mini SIM and cut it down to a micro SIM with an art knife. Since the SIM is working just fine I saw no reason to go buy a new uSIM from Orange, but perhaps I should try that route.

@anthonyamber I have a brand new micro SIM from Vodafone - all official - and that gives SIM Failure too, so I don't think I'd bother with replacing your SIM to be honest. It really seems to be a software issue.

@aaron1266 Is iOS beta 3 only meant for developers or can mere mortals install it too?

I'd like to know (but probably never will) what percentage of iPhone 4S users are experiencing this problem. i.e. is there a link between certain conditions and the iOS version that causes the fail or is it just bad luck for some?

I went through two iphones in less than thirty days because of this issue. EVERY FIX IS TEMPORARY--ONLY!

I love apple but the iphone is flawed. I took mine back, got my money back including the restocking fee. End of story. My cheap LG phone works like a champ. Don't drink the koolaid folks, don't drink the koolaid.

I've had the "call failed" problem since about the 23rd February, so only a couple of days. It was working flawlessly when I was using the phone extensively on Wednesday morning. I manage to connect to the person I am calling but the call fails within about 30 seconds. It's not a problem with incoming calls. I am going to test it away from my wifi this morning, to try to pin down when it's a problem, and will then be heading for the Apple Store.

You are lucky. I have had my iPhone replaced 6 times in 60 days, and more then 75% of my calls fail and on almost almost 100% of the calls the quality is so bad, I have to use a land line to complete the conversation. (I can usually hear fine, the person to who I am speaking can rarely hear me). Apple blames the carrier AT&T, and of course AT&T blames Apple.

Has ANYONE RESOLVED this problem yet? I am up to replacement phone #6 today, and about 10 fresh OS downloads. As soon as I got the latest phone home, no one can hear me (or barely hear me) at the other end. Call Fail problem is likely back, but I am so exasperated, when someone calls my iPhone, I just immediately call them back from my land line. I have tried everything (I think) everyone has suggested on here: totally disabled SIRI, turned off WiFi altogether, turned off 4G, and ensured I have a fresh / latest version of IOS. What else is there? All the non-phone crap seems to work fine. But my iPhone works more like a mini iPad and is useless as a phone. P.S. I know it is not the carrier, as when I use the iPhone 4S with Viber or Skype for Internet calls, I experience the same poor quality, i.e., I can hear the other party, but they cannot hear me. Each time, I switch to my old iPhone 3G which is no longer activated with a carrier, but is WiFi enabled, and the Skype and Viber quality is perfect. So it is also not an environmental or location specific cause of the problem. ANYONE?

Since upgrading to iOS 5.1 my SIM Failure problem on iPhone 4S appears to have been resolved. I hope more people enjoy a similar fix, but judging by some of the posts here there are still many struggling with problems.

I've the same problem, too many dropped calls and most of the time I have to dial three or four times just to connect and also takes ages to connect never had this issue with my gs2. Sometimes my friends won't hear me either. I hope they solve this issue.

I had exactly the same problem. Exactly the same problem!! Ken explained it so nicely in step by step manner.

I purchased a phone (iPhone 4s 16 GB from Canada now being used with Vodafone India) which already had 5.0.1 had terrible call fail issues.

I tried various things as my device was already 9A406. Combination of switching off cell data, 3g, chaging network settings from manual to auto and what not but nothing worked.

Throughout this time my cell phone signals never got above 3/5. Ever 5 minutes my cell was showing networks but when I dialed a number, it said call failed and then searched for networks and then once done setting up network I could dial the number for next 5 minutes till the same thing happened.

When I dialed from another number to mine, it said my phone was not reachable when it was showing 3/5 bars of signal.

HOWEVER THANK GOD I FOUND A SOLUTION... and an easy solution.

JUST UPDATED TO iOS 5.1 and you are saved.. (9B179)

I assume that when this thread was created, 5.1 wasnt available so I can imagine what people facing this problem went through.

Ever since I updated to 5.1 I get 5/5 signals on the same places i used to get 3/5

Thanks & Regards to all you lovely people who contribute here.

Mohit

Last new iPhone two weeks ago was upgraded to OS 5.1 the day it was announced, and the problems persisted. Two days ago I got another brand new model, and 5.1 was installed as a new iPhone in the Apple Store. Two hours later the first call I received, the same problems. Since the original post in this forum, many other problems have been posted, so to be clear, I am reposting below the original problem as explained by the author, because it is the exact same problem I still experience three months and six iPhones later: "

QUOTED: "My iPhone 4s phone call failed more than 50% times, some times people can't hear my voice, is there anybody else has same problem?"

I do not experience any other problem as many have described here, some of which may have been fixed by OS 5.1. Again to be clear: Apple engineering if you arre reading this, the original problem has NOT been fixed.

Hello.

Just that it has been a few days now since I wrote my post about how things were fixed with updating to 5.1. Here is some more continued information.

1) Calls do drop at times but at a very very low rate as it used to do before. Before the device was unusable. (When 3Gs off)

2) 3G networks are still low but call drops and fairly less. I switch to 3G only when I need a faster download speed else I stick to normal connection.

Phone is now usable and call drops are EXTREMELY Less which can happen coz of the network issue to.

Even if 5.1 is not helping you. THen I do not know what would.

Thanks

Mohit