Celcom bullshit.

3G suddenly off at my office area last week. Now cannot receive calls while connected to 4G. VoLTE not available even though phone is in the Celcom approved list.

This is being "very careful" with the shutdown of its 3G network to ensure no implication arises on 4G users.

Wonder how many % of the 98% 4G devices are in their VoLTE approved list.

There are 2 problems here
1) Non VoLTE call receiving not working properly. 4G not falling to 2G to receive call. Either not doing it at all or it takes too long that caller "gives up"

2) VoLTE support. Only limited models supported. If the phone is not in supported list, then no VoLTE even if the phone supports it.
Worst when phone is in supported list and still no VoLTE. Then telco blame phone manufacturer and vice versa. In the end no solution.

Actually, if we can "fixed" the calls to be on SIM2 slot only, then, SIM1 is prioritized as Data only (so that it can be connected constantly to 4G).

Eg:

SIM1 = data only = P1 webe #BEBAS Unlimited Hotspot 7Mbps = RM35/month
SIM2 = Primary number for calls/SMS/TAC/MSOS = Yoodo 4,000 minutes/month = RM12/month

With combo above, the phones will always be on data connection while calls/SMS is channeled to SIM2 all the time. Just ensure the line to be on data is slot into SIM1 always. Usually, old model and mid-range phones will set SIM1 as "more features" than SIM2 slot.

Not encourage to use e-SIM. But, can try to set the data on the physical SIM to see the data can be used or not.

Does that eSIM connect to VoLTE?

Tested today, 14 Nov , on my Yoodo / Celcom
Area: Subang Jaya (Petaling district)

Status: Still active - Still able to use 3G data. Tried making a call to my own number, it still works.
Using Cell Info - Managed to spot 2 3G towers active and able to connect. 

Supposedly on 11th they want to switch off the entire KV , but this is what I am seeing.
Anyway, I will just monitor from time to time.

Apparently Celcom (their mother-ship) says this:
https://www.malaysianwireless.com/2021/07/y...rs-end-of-2021/

End of the year baru Celcom turn on VOLTE for its prepaid customer. I believe this applies for its MVNO also.
Why the segregation / discrimination , Celcom? Follow too much of Maxis foot step is it?

Anyway, VOLTE or not, it doesn't make me worried.

Hope  wont cause  too much issue to outskirts  of kl.

unifi mobile VoLTE have nothing to do with celcom.
phone not on the list dosen't meant not support
phone on the list, no volte well nothing can do.
https://unifi.com.my/mobile/postpaid/phone-compatibility

The easiest way to know 3G has been "re-farmed" or still running for SIM1 (or SIM2...)

And how's the performance of the "re-farmed" LTE ...?

No I always turn off data during MySejahtera check in I no about it actually I’m helped some of them of who are struggling during check in.
I meant during we connected with network just as turn on data for all time

The HSPA is dedicated for Axiata's MVNOs....(?) (until March 2022...?)

This is the definition of what a failure this government has been over its idiocy in infrastructure planning and implementation.

Buy new 4G phone, or use telcos that has VoLTE, and then throw your old phone to the e-waste bin.
If no budget, then make use of the Pakej Peranti Keluarga Malaysia offer, where you get get entry level phones at lower price but with postpaid contract plans.

That's the official advise they'll give you.