Singtel Wifi calling

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GlassDoor

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works only on my spare iphone 7. Not working on more recent generation of iphones (14P, 14PM, 16Pm and 17PM)
just saw reports people still having problems 3 days in. Just glad got signal and can work.
moment of reckoning for them
 
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xiaofan

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GlassDoor said:
works only on my spare iphone 7. Not working on more recent generation of iphones (14P, 14PM, 16Pm and 17PM)
just saw reports people still having problems 3 days in. Just glad got signal and can work.
moment of reckoning for them
Click to expand...

Some users are complaining SingTel down again now on Facebook Singtel page. Looks like there may still be issues, especially 5G.

My SingTel and Zym lines are both okay, with 5G SA connection.
 
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GlassDoor

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xiaofan said:
Some users are complaining SingTel down again now on Facebook Singtel page. Looks like there may still be issues, especially 5G.

My SingTel and Zym lines are both okay, with 5G SA connection.
Click to expand...
my household got 5 ST lines. 1st day all 5 down, 2nd day, two still down until late eveing then recover.
the 2 that was still down on 2nd day were 5G SA plans. It's a heng suay thing... I suspect their network slicing plus QOS efforts have made recovery more difficult and inconsistent. I don't have facts, just speculating.
 
Jurong640

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GlassDoor said:
my household got 5 ST lines. 1st day all 5 down, 2nd day, two still down until late eveing then recover.
the 2 that was still down on 2nd day were 5G SA plans. It's a heng suay thing... I suspect their network slicing plus QOS efforts have made recovery more difficult and inconsistent. I don't have facts, just speculating.
Click to expand...
that make some sense about network slicing. Singtel MVNO's aren't really affected, we get lowest priority and bandwidth
 
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xiaofan

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GlassDoor said:
my household got 5 ST lines. 1st day all 5 down, 2nd day, two still down until late eveing then recover.
the 2 that was still down on 2nd day were 5G SA plans. It's a heng suay thing... I suspect their network slicing plus QOS efforts have made recovery more difficult and inconsistent. I don't have facts, just speculating.
Click to expand...

My guess is a bit different -- I am guessing the new 5G SA customers from SingTel Prepaid, Gomo and Zym/Zero1/VIVIFI/CMLink somehow stressed out the 5G Core Network.
 
Jurong640

Jurong640

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xiaofan said:
Actually Gomo customer is also affected. They are also have lower priority.
Click to expand...
Maybe Singtel have different Low Priority.

Low Priority Plus - Gomo
Low Priority Enhanced - Zero1, Zym, Vivifi 5G SA
Low Priority Lite - Zero1, Zym, Vivifi 5G NSA / 4G
Lowest Priority - Heya, Singtel Hi!

They segment it very well, till now very complicated
 
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keenklee

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GlassDoor said:
my household got 5 ST lines. 1st day all 5 down, 2nd day, two still down until late eveing then recover.
the 2 that was still down on 2nd day were 5G SA plans. It's a heng suay thing... I suspect their network slicing plus QOS efforts have made recovery more difficult and inconsistent. I don't have facts, just speculating.
Click to expand...

IMHO.
I suspect if you are an original SIngtel customer who never ported out, they remove you from their database.
My household that 1 line is like that. When I call the line, the message was "the number is not in use". That line only recovered when call 1688.
 
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neptunesea

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xiaofan said:
My guess is a bit different -- I am guessing the new 5G SA customers from SingTel Prepaid, Gomo and Zym/Zero1/VIVIFI/CMLink somehow stressed out the 5G Core Network.
Click to expand...
I doubt this idea, if it were the case, it would likely be limited to a small group of users who face trouble registering onto the network, while users already connected may face lag, however this seems to affect a large population of users who face a total lack of connectivity.

My guess is that its due to a buggy configuration / software update pushed to the network. In such case it is not surprising that it would take engineers an hour roll back and restart the network.

Otherwise it could very well be a cyberattack.
 
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xiaofan

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neptunesea said:
I doubt this idea, if it were the case, it would likely be limited to a small group of users who face trouble registering onto the network, while users already connected may face lag, however this seems to affect a large population of users who face a total lack of connectivity.

My guess is that its due to a buggy configuration / software update pushed to the network. In such case it is not surprising that it would take engineers an hour roll back and restart the network.

Otherwise it could very well be a cyberattack.
Click to expand...

Good hypothesis, especially for the first incident on 16 March 2026.

My guess is based on the complaints that 5G customers are more affected and SingTel kind of adviced the user to stay with 4G network on Facebook.

Anyway, let's wait for the investigation reports later. Three incidents may have different root causes.
 
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xiaofan

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xiaofan said:
One more difference found between Zym and SingTel SIM Only.

Previously I attributed the lack of VoWIFi support for my Zym SIM card to the use of SIM2 slot.

But today I put Zym SIM card on SIM 1 and SingTel SIM Only SIM card on SIM 2. Then I find out that SingTel SIM still works with VoWIFi if I use airplane mode but connected to home WiFi. Zym SIM card does not work.

So looks like Zym does not support VoWiFi (Voice over Wi-Fi).

Any users here got VoWiFi working?
Click to expand...

This is what I find out about Zym.
 
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