Call Forwarding Breaks with iOS 8.3 Update on iPhone 6 and iPhone 6 Plus with AT&T

Yes, I am dealing with this right now on at&t with a 6 plus. I've been down the same road as you. I got it to work with a windows phone yesterday but not my 6 plus when I switched back to the iPhone. My wifes 6 works fine. I believe it is an at&t issue and not an 8.3 issue. After dealing through several levels of support at at&t, they are telling me it has to do with their transition to hd voice. Some people are having this issue because they are updating their system and some peoples phone profile, on phones that have hd voice capabilities, are not getting added to their line and call forwarding will not work without it. I have a trouble ticket open to their engineering dept and they promise it will work for me on or before the 24th of april. Engineering has to build my phones profile so call forwarding will work with my iPhone.

This is frustrating because like you, I need to forward my calls because I have no signal in my office and need to forward to another phone so I can get my calls. If at&t would quit dragging their feet and enable wifi calling, this wouldn't be an issue for me. I would suggest you put more pressure on at&t and escalate this until it gets resolved. Or put your sim in a phone that does not have hd voice capability and see if it works then.

Good luck. I'm keeping my fingers crossed this will be fixed for me on or before the 24th. We'll see.

EDIT: I see you did put it in another phone and it worked. That backs up that the issue is at&t and their hd voice upgrades. They had no explanation as to why some work and some don't, but have them make sure a profile for your phone is on the line. If not, they'll need to build one for the phone so that it''l work. At least that's the story for now. Like I said, I'll know more in a day or two.

No. AT&T says I need reeducation on how to use call forwarding. Even after I told them I can put my wife sim in the phone and forward a call without any problem, they refuse to believe it's on their end. Their is no there way around it. AT&T has my profile screwed up and won't take responsibility to fix it with an iPhone. I put my sim in my blackberry and it forwards just fine. Just not with an iPhone. Changed sim, no difference. Until AT&T fixes it in their system, I can't call forward.

They would rather blame me for being stupid or apple for a broken phone, even though it forwards fine with my wife sim in it. Good luck getting them to fix it. Pretty useless. Hope you have better luck than me.

Just thought I'd post a followup to this issue. I did get it fixed. Finally talked to someone at at&t who knew what he was doing. Turns out the issue for me had to do with the fact that the phone i had was bought at apple and was unlocked. Since the phone didn't originate from at&t, it didn't recognize the imei number in their system and couldn't create the full profile for the account and the iPhone. Turns out, if your phone is unlocked at&t can't set up call forwarding and profile correctly. Once he set it up using my wife imei number for call forwarding (phone bought at at&t) call forwarding worked fine. Crazy, but that's what turned out to be my issue.

The issue is tied to your unlocked iPhone.

I have an iPhone 6 locked to AT&T running iOS 8.3 and call forwarding works just fine.

Unfortunately, sberman is correct. I've fought this for over a month and a couple trouble tickets and level three support with at&t. It is NOT an apple issue, per se. It turns out, when an unlocked at&t iPhone 6 imei is put in at&t's system, it shows up as a test device. Everything works except call forwarding. Long story short...there is nothing apple can do about it and anyone you can talk to at at&t will be able to do nothing for you. If you also have an at&t iPhone 6 around, have them put that phones imei number on your account and watch call forwarding turn on. Problem is, it'll only last about a day until the system scans your real phone and changes the account. The problem lies with at&t. I had to have call forwarding so I bought an at&t iPhone and am selling the unlocked phone. After 14 days, at&t will unlock it for you anyway. Just wish I didn't have to do a restore to unlock it though. As soon as I put the at&t iPhone on the account, call forwarding worked and has worked since. Good luck, but you're beating a dead horse fighting this with apple.

Unfortunately, I have the same issue with a unlocked iPhone 6 bought new from Apple, and have escalated this with both Att and Apple with no solution. jtmo3 and sberman, are you 100 percent sure it is an ATT issue related to unlocked iPhones? It sure seems that way by anecdotal evidence on this forum. I certainly would like to find a solution

100% positive. Since getting the at&t phone, not a bit of a problem with call forwarding. For some reason, at&t can't figure how to get the imei from an unlocked iphone into their system correctly. You can fight it all you want, but in the end, at this point, unless you use an at&t phone, you're out of luck with call forwarding. Is it stupid on at&t's part? Heck yes. But I have a need for call forwarding, and fighting their system wasn't getting what I needed.

Good luck. I went into an at&t store and told them I wanted to buy an iphone but if call forwarding didn't work when they activated it, I was returning it right then. They agreed. Activated the phone and call forwarding has worked since.

Update, I just received a call from ATT as a followup, and was told that unlocked iPhones will not have all features available on the ATT network.

The rep told me that because unlocked iPhones are not 'programmed' for ATT, and don't have or will not generate the correct 'frequencies' to initiate all features available on their network. And she told me therefore my call forwarding issue is not correctable with my unlocked iPhone. Looks like I too will need to return the unlocked iPhone and get one 'programmed' for ATT. Seems ridiculous, but this is what I was told.

OK this is going to seem crazy, but suddenly call forwarding is now working on my unlocked iPhone 6! Both with using codes and by using the toggle.

This after I got off the phone with ATT as I posted above. I really have no direct explanation of why it is suddenly working for me, except that when I enter the number I want to forward to I use the + symbol and a 1, such as: +1(XXX)XXX-XXXX

Mine worked too when they put a an imei in to test it from another at&t phone. The problem is the next day when the system scans and sees the iphone I had and the imei on it and substituted it, it quit working again. So, the frequency thing they told you is not correct. The phone has all the correct frequencies/bands in it to work as you can see from yours working now. It's just not able to use the features because at&t's system will not recognize the imei correctly to make it function. Hopefully, yours stays working. Let us know. For me, it wasn't worth the hassle since if you look on apples site, you'll see there's very little difference between the unlocked and at&t locked phones. Basically just bands used in other parts of the world. Besides, after 14 days, at&t will unlock the phone for you if you own it.

My unlocked iPhone model A 1586 is still call forwarding fully functional. This after I was told at one point by ATT it would not work, and there was nothing they could do. This after a previous week of escalating the issue with ATT and Apple. I am not sure what solved the problem but here is a brief synopsis of the steps I went through:

Established case with ATT, went to various levels of phone support. Did all the restarts, restart network settings etc. etc..Could not help.

Went to ATT store to get new SIM card. Made sure IMEI number matched. No luck.

Went to Apple store next. Went through most of the same procedures as I did with ATT phone support. Did a complete erase and restore, did not work. They gave me a new phone, did not solve problem!

Again went to ATT store. Discussed all the issues on this and other forums. Asked for another new SIM card. Made sure call forwarding was active on the account. Still call forwarding would not toggle on my iPhone, nor work with telephone code entry. Baffled the store reps! Put SIM card in their active iPhone and toggle call forwarding worked, then back in my iPhone and call forwarding toggle would not work!

Next day I get a call from ATT for followup. Tell the whole story again. Rep says hold on, she has the best iPhone guru near her. I hold and she comes back that unlocked iPhones may not activate all iPhone features on ATT and is not fixable. See my previous post. She again makes sure that call forwarding is showing active for my number in the ATT system, turns it on and off at her end. Still no luck on my iPhone to either toggle or enter phone codes to get call forwarding to work from iPhone.

Later that day for the heck of it I try again entering the phone numbers I want to forward to in the format 1(xxx)xxx-xxxx. Still does not work. Then try using the +1 format such as +1(xxx)xxx-xxxx and it works! And it has been functioning properly since, both with the call forwarding toggle switch or entering telephone codes.

So what fixed it I am not sure, but if you are having the problem I would get a new SIM card, call ATT and make double sure they have the correct IMEI and call forwarding enabled or provisioned for your number, have them turn it on and off and then on again at their end, and use the +1 code for entering numbers you want to forward to.

I had this problem as well. The people at att were not very knowledgeable or helpful, but I had them check my imei number which apparently was not automatically updated when I bought the unlocked phone (iPhone 6). When the att representative put the correct imei number into their system, the call forwarding function instantly started working correctly.

The problem identified by others is with the carrier, not the phone. In my case we switch between Bell in Canada and Verizon in the US. Here is how I solved the problem. My wife has the unlocked 6s and I have a 6. I put both phones in airplane mode and then I switched the SIM cards. Now my phone had her number and the call forward was on. I was able to turn it off using the normal procedure. I Then put both phones back in airplane mode, switched the SIM cards back and all was fine.