Caller ID shows "Unknown"

Probably both. Charter won't know what to do about it unless it is escalated to their network engineering department; I don't know how well equipped they are to escalate issues from tier 1 tech support. AT&T already knows about it, but adding more fuel to the fire can't hurt.

The outgoing caller (not the person being called) determines if their ID is shown. From a land line in the U.S., even if you generally have your outgoing caller ID visible, you can precede the number you're calling with *67 and hide your caller ID for this next outgoing call.

Whether the person calling you is in your contacts list or not has absolutely no effect on whether you see "Unknown" when someone calls you. If the caller has elected to display their ID when calling:

• If they are in your contacts list, you will see their name.
• If not, you will see their phone number.

But in either case, you will see "Unknown" if they block their caller ID from being displayed when calling.

This is something that is happening for the new VoLTE services that AT&T and Verizon are trying to use. They are still in the test mode, and are not working well. Go into Settings>Cellular and turn off LTE for voice. Instead of Voice & Data, set it for Data only. It seems that this Caller ID issue is one of the problems they are witnessing. Just turn that to Data only, power the phone off/on, and then test. It should work after that.

Interesting.

You told us your cellular carrier is AT&T. I wonder if you can see these incoming telephone numbers on your AT&T bill.

You might try logging in to http://www.attwireless.com . I believe you can see recent calls there, even those that have not yet shown up on your telephone bill.

Do these telephone numbers show up there?

There's another long thread on this subject. So you don't have to read 20 pages of it, here's a summary of the cause: Basically, it is a bug in how carriers manage Voice over LTE (VoLTE), which is the default for the iPhone 6. That is, instead of voice being a separate audio channel at the carrier's towers, voice is digitized and sent to the phone as data use LTE. The phone converts it back to audio. The problem occurs only with calls from VoIP phones, such as office PBXes and cable phone service. And only some of them. It's an incompatibility between the was VoIP service sends calling line ID and what the network expects. Both AT&T and Verizon have said they are working on fixing it, but haven't given a timetable. The current workaround is to call the carrier, ask to be escalated to a Level 2 tech, and say you want to have VoLTE disabled for your account at the carrier. It is not sufficient to just turn it off on your phone.

I'd think you should at least report it to them. It sure can't hurt. Just try to avoid sounding like you're complaining and that it's "their fault". They need to understand you're reporting it so it can be looked into, not trying to lay blame. Otherwise, they'll just blow you off and lose the trouble report.

That is exactly what the problem is. As I said, and Lawrence echoed, you can turn off the voice & data on your phone and it should correct it. It will not really make any difference to you, since the GSM phone from AT&T already has the ability to do voice and data together anyway. Only Verizon customers are still inconvenienced with no voice and data at the same time.

You can let Charter know about it, in case other customers call them with questions, however there is nothing they can do on their end. It is not their issue to fix.

You may have to follow Lawrence's instructions. Usually people that have turned their devices from voice & data to data only have recovered. If your friend has AT&T land line, it is not affected by this. The Caller ID info is getting through, and matching your friend's contact card in your phone.

Housedoctor wrote:

Report to who Tim?

Charter Communications. AT&T is aware that there are problems, but you may want to report it to them as well. It's more likely to be resolved if it's being worked from both sides.

From the technical analysis in the other thread, it's really a problem on both sides. Some VoIP providers work. For example, I have Optimum (Cablevision) and I get caller ID from my Optimum VoIP number to my mobile. It seems there was an update to the caller ID spec, but not all providers updated their systems to match the new spec. The ones least likely to are private exchanges, like your doctor or other businesses. Meanwhile, the cell carriers assumed that everyone had updated, a bad assumption. My guess is that Charter is one that did not. So AT&T & Verizon may have to make their systems backwards compatible, but they would prefer not to, so they may be dragging their feet.