just forget about volte lah.

other requirement
- device of both caller and receiver must be volte-enabled
- thus, both caller must also be inside LTE network (else, how to be "over-LTE")

i was googling further when gogo2 said he couldnt get volte working when locked. i thought volte is separate band than whatever band the device was locked to. no luck on the band thing.

it wasnt logical, but even us's telco sites mentioned it requires both side to be volte.

my phone supports volte, but i'm not bothered to validate.

This post has been edited by cicak.fakir: Sep 13 2018, 10:08 PM

now that makes sense.
so probably, those that locked to specific 4G band eventually had to step down due to weak signal, but since it's locked, failed. and all were under impression that it is volte that failed spectacularly.

what is being conveyed is, if the 4G signal is not fit enough to hold volte conversation, only then it will need to fallback to 3G similarly as if volte is never available in the first place.

my i150 is in b315. not volte-capable in the first place.

my phone is on celcom and maxis. capable, but not bothered since i'm not on-screen when a call is on-going.

hey, i'm not doubting what you are experiencing. cool there.

my theory is that, probably volte is on separate band than what you are locked to? ive nothing yet to support nor debunk. probably prosibu knows better.

my place have digi 4G on 900fdd and 1800fdd. the 900fdd is only 2 bar while the 1800fdd is full bar.

if i use hmanager to lock to specific 4G 1800fdd, no call can go out nor ring in.
if i set 4g-only via hilink (i.e. any available 4G band), it will step down to 3G though when making or receiving calls.

so, device that wants to use VoLTE *MUST* still be able to fallback to 3G - as failover. VoLTE is just a preferred option when possible.

this requirement of VoLTE needing to be able to failover to 3G is applicable to only Digi network? all in malaysia? or wordwide?

probably not important, not a must. some countries, like australia, no longer have 2G signal, all refarmed into LTE.

if you have to step down all the way to 2G, you must really really really be outside mapped civilizations.

oh wait - part of my kampung land is 2G-only.

errrr, yes, you shouldn't sign up. this plan is not "unlimited" as advertised. it will cap you to 1TB. let everyone else who took the bait suffer from this among ourselves.

for the rest of us, suffer zero quota. BUT, speed will be "managed" after 1TB though. poor us.

digi fooled us; you don't join us, okay?

mine was getting around 30Mb/s+ to 50Mb/s+ end of last year.
get the huawei's "rabbit ear" antenna.

this, reading just now without the rabbit ears. B315 is more than sufficient - "still using an older LTE chipset" SHOULD NOT be an excuse to unnecessarily spending your money.

LTE is MIMO, so 1 for in and 1 for out.

and, the ears should be at different angle i.e if we take pointing straight up to the sky @ 90° as the reference, then one could be pointing 45° to the "left", and another at 45° to the right. the concept is about how the antenna radiates - since it's like a ring pattern around the stick, at an almost similar frequencies, making it radiating at different angles reduces the interference and cancellations the antennas are causing each other. I am googling but couldn't recall where did I read this. it was like a research paper.

diagram at the top of the following on what MIMO is. (applicable concept to both LTE and WIFI MIMO)
https://www.mwrf.com/test-and-measurement/a...ireless-systems