Issue with 3CX on iPhone 11 – Unable to Answer Calls on Mobile Network

[MohammedFaizan]

Hi everyone,

I'm facing an issue with 3CX on my iPhone 11 and need help identifying a solution.

Scenario:
I have installed the 3CX app on my iPhone 11. When connected to mobile data, I am unable to answer inbound calls—they simply won’t pick up. However, when I switch to a Wi-Fi network, calls work fine, and I can answer them without any issues.

Initially, I suspected this was a problem with my mobile network provider. To test further, I enabled mobile data on my phone and shared it via a hotspot with my colleague. He connected his device to my hotspot and was able to receive and answer 3CX calls without any issues.

Since the issue persists only on my iPhone while using mobile data, I am unable to pinpoint the exact cause or find a resolution.

Has anyone encountered a similar issue or have any suggestions to fix this? Any help would be greatly appreciated!

Thanks in advance.

 

[fortech]

Hi, this sounds odd. Only a few easy test things spring to mind,
(a) did you already remove-and-reinstall the 3cx on the iphone? I have seen a few cases where a stale app might act weird, and a new install helps. This does not sound likely, but maybe worth mentioning.
(b) sanity check - if you get a laptop <> tether it to mobile-data-hotspot from your cellular-iphone-mobile-phone -- then use 3cx web-app on the laptop - you can make-receive calls fine (with your EXT in web client?) which suggests the mobile carrier data/network is not having issues talking to your 3cx instance.

Assuming this is all done already. Then? maybe we wait for a 3cx team person to followup, and they might ask you things like
what version of the IOS 3cx app have you got installed?
anything?else they might ask - we shall see I guess.

Ugh.

Can you easily flip your SIM to a different device (ie, different iphone, or an android phone) just to do a test call from there
ie, use your same cellular/data service - different phone device - see if the problem sticks to the phone vs follows the SIM ?

sorry I can't give any real help here (maybe)

Tim

 

[NicholasP_3CX]

Do you have "Also ring my mobile" on by any chance?



This setting is NOT required when using the 3CX Mobile app. What this does is activates a GSM call out to your telephone number.

Some telcos when they have an incoming normal GSM call, they cut off the data connection, which would be why you cannot answer when on your mobile data, but can answer when the phone is connected to wifi.