Intermittent Incoming Calls Going Straight to Voicemail with No Ring

T-Mobile network is faulty and that's a fact. they will try to deny it and run a test and the stores don't know anything that's mostly just some kids in there. They don't have a clue when you call customer service they run a test over the phone and then tell you it's your device I just got a brand new iPhone set up yesterday and I am looking at the same problems as with my other phone that I just warranted out and just got done setting up today it's a network problem and based on all this feedback on this page it's been going on for years. All my settings are turned off of call, blocking call, forwarding unknown, caller, blocking, etc. I've had Sim card switched out on my old phone I've had everything possible done and then I warrant out my iPhone and I'm on a brand new iPhone today and my brother is standing right next to me calling me numerous times and only  half the calls are coming through the other half go straight to voicemail so obviously I've been wasting tons of time. Thanks to T-Mobile warranting out phones through Apple and sitting at the iPhone store at the mall numerous times in the last couple weeks because T-Mobile keeps trying to deny that it's their fault and it's their issue and saying it was my iPhone which obviously it's not. I'm sitting here right now at my office with a brand new iPhone that's less than 24 hours old and just got done downloading all my stuff from my other phone and it's the exact same problem 🤬🤬🤬🤬🤬

So I have (had) been having this issue of all calls going to voicemail when I went from my Apple Iphone 14 pro max to my S22 Ultra, all of the calls on the s22 ultra were going straight to Voicemail if someone called. 

I checked all the usual suspects, spam blocking. call forwarding, DND, all of it was correct and not blocking the calls. I even tried turning off wifi calling and bluetooth like these forums suggested. 

Additionally, I spent 4 to 5 hours at the store trouble shooting the device and we finally came to the conclusion it was the line not the device. because when we put the SIM card in another phone the same results happen all calls went to voicemail. if the call called right back the device would ring. 

The store manager called tech support and put a ticket in and they were going to take 3 days to get to it, which was totally unacceptable. So she told me that is extreme cases what she would do to correct a problem with a line is the following. 

She would cancel the number on the mobile phone account that was giving problems and then reinstate it 5 minutes later and that would clear the issues with the line because you are technically starting over fresh again. 

We did this today with my line that kept going to voicemail and trust me I was suspect of the idea. But then after we went through the process which took a total of 45 minutes at the store it was fixed and I have had no issues since.  

So as a last result I would recommend doing this to clear an issue you are having with your line if you have ruled out that it is NOT the device.

Hope this helps.

I have an android phone and I tried a lot of things (new sim, restarting phone, turn off spam, turn off all battery optimization, turned off 5g phone calls, turned off Wifi calling)

What actually worked was turning off “Visual Voicemail”

Go to phone app → Settings → Voicemail → turn off Visual Voicemail

I do not know if turning off all the other stuff had any impact but I will be slowly turning back on the Spam Blockers, Wifi Calling …. 

I get tired of endless try this or try that !! Hours wasted!! Just answer the question!!!

No time or date on voicemail!!!  Fix it!!!

I am having this issue daily. The calls also show up on Scamshield but never ring through. There is no rhyme or reason to it but I am about to switch to Verizon. These are often work calls and they are important.

What KF6OLQ says is accurate. Been dealing with this for years. And I use Google Voice as my voicemail. "I believe" the problem is with the Supplementary Call Services, the Call Forwarding rules: Call Forward Busy, Call Forward Unanswered and Call Forward unreachable, which all have a default 15 second timer. Basically the system waits 15 seconds before initializing said action. The question is when does this timer begin. By extending the timer out, it's definitely helped, at least in my case. I have mine extended out to 25 seconds. T-Mobile has self service short codes you can use to change this timer.

https://www.t-mobile.com/support/plans-features/self-service-short-codes

**61*15555555555**25#    Call Forward No Reply

**62*15555555555**25#    Call Forward Unreachable

**67*15555555555**25#    Call Forward Busy

Even though the short codes site only shows 61 being able to extend the timer, I tried it with the other two code 62 and 67 and it all took. **61*, **62* and **67* is the condition. 15555555555 is the number to your voicemail. **25# is the delay. From the site, shows you can use 5, 10, 15, 20, 25, 30 seconds.

Go to the phone dialer, enter the full code (make sure you enter your voicemail number) and dial (green phone icon in my case). You should see a quick pop up towards the bottom saying MMI Code Started. Then get another pop saying Registration was successful. If you get a failure, try it again.

The only downside to this is the caller on the other end is going to have to wait longer before they're sent to your voicemail. If this works for you, consider this a band-aid and not a solution.

Been having this issue with 1 line on my account. It all started when we upgraded the line to the iPhone 15. It has been going on since October. Have spent countless hours on the phone with T-Mobile with no fix.. really looking for an answer on how to stop this from happening. Going to try turning off live voicemail and see if that fixes it…