Dear kvn4000,
Nothing got to do with your signal.
Its because your modem is connected to a base transceiver station, which is connected and shared with estimated 10-20 users.

Furthermore now its MCO period, Muyideen cakap tolong duduk rumah diam diam.
Then everyone sits at home, diam diam, use their internet, just as you also.
So this is where the Base Transceiver Station is congested with 20 other users around your area, usually a radius of few KM.

So, no, booster wont help. Even you sit next to the station, wont help.
Another advice? Change DNS. that will help abit. but not drastically.

Currently I'm using 2 Yoodo lines. One as my Wireless Broadband (that means without any voice add one), another is my own personal line.

When you talk about different cell ID, its probably same tower, different antenna. Cause your last 2 digit is the same.
As you know, one tower may have 3-5 antennas.

I think for my case, its always at night that the speed is alot slower. Sometimes I have to resort to switching from 4G to 3G just to get acceptable speed. And now with MCO, its even worse on the 4G side. So I'm not going to complain to Yoodo, because it will be like shooting blank bullets, although I did feedback to them once , way before the 1st MCO . And they do acknowledge that one of the tower that I use, is consitently congested. Whether Celcom will get it fixed or not, it depends on them.

For me, I'm not into gaming so ping is not a criteria for me, though if it gets annoyingly slow for browsing or Youtube then I will notice that.

Bro, 2-8MBps is still tolerable.
Im on Yoodo and I'm not saying Celcom sucks and not recommended. Also same issue, except worse at night.
You have to remember that you are sharing tower with others like [skylinelover] mentioned . 1 station to cater 20 users. Backhaul at the station only 1 pipeline.
And probably Unifi Air, is sharing bandwidth with other Unifi Mobile LTE users, seeing from their website coverage map.

Sometimes my Yoodo will struggle to buffer at night, and "Youtube stats" will show bandwidth within 100KBits-500Kbits. Yes. You heard me.

BTW, read this:
Philippines asks Netflix to drop streaming quality to ease congestion

If you dont like the idea sharing bandwidth, then you have to get Unifi fibre. Your own private internet. Full speed, though I think now Unifi backhaul will be partially choked also.

This post has been edited by SleeplessEyes: Apr 2 2020, 10:19 AM

Not true.
Like for me, my apartment has Unifi port. In fact the previous owner installed Unifi, so the port is already ready available in my house.
But no, I decide to go wireless. Slower nevermind. Importantly portability.
because I want to pay for subscription that I can bring to multiple places. Like to my mom's place or on a holiday trip whereby some hotel doesnt give free WIFI.

Per month I allocate on my Yoodo wireless BB, 40GB data and 20GB Youtube add on.
Every month, i use up 90% on both data and the Youtube add on. So thats why I am considering to see if I could switch to Unifi Air. But use my own modem. Dun want to be tied down on a contract and swear later.

Sorry I am currently not using Unifi Air at the moment to answer your question.
But I believe it's not geo locked.

One suggestion is to check the signal (not the bars) reception value, RSRP and if possible , to see what band its connected to.
Anything below -90dbm (higher number means weak signal) such as -110dbm, means your modem reception with the station is weak.

Changing modem location in the house, might help switching to another BTS (Base Transceiver Station).

Glad that you finally solved the problem