Only iPhone ?
Any list of the phones that support volte ?

I use Umobile for internet at home for a few years and have always had a great experience with it, subscribe mostly to the MB128 plan and switched to the MB50 plan since now got the 12Gb promo.

But since February, suddenly their 4G coverage in my apartment dropped from full-bar to barely 1 bar. I have lodged a complaint and initially the CSO told me it was due to a transmission cut in the area, that was 2 months ago. Ever since I have not been able to receive a stable connection on their LTE network.

I suspect they had actually dismantled the eNodeB and moved it to another area to provide coverage, forcing most users in my area to fallback to their 3G network which I again suspect is now congested because of the pathetic speeds I am getting.

Area being Ampang Ayers Tower. I work in telco, and I specialize in RAN side so unfortunately those CSOs aren't able to fool me. This month will be the last month I subscribe to Umobile, I'll be switching to the Maxis plan now which is slightly more expensive but at this point is much more worth it.

In my case, don't need to re-register the same number with bank after mnp to UM. Still can receive TAC etc...