(apologies if the post is a bit haphazard - I had changed it a few times in the middle so it might have some loose ends in between, and 12.44 AM doesn't help much along with mosquitoes roaming near my face)
It was a poor business decision which they now have to stick with. I've used their CA 5+5Mhz in Islamabad/Pindi and honestly, you can get average speeds of around 20Mbps easily - provided the signal quality is good. The highest I managed to get was around 50Mbps, I think (I posted a speedtest in here).
As for why they're focusing on 3G: well - since no operator has
broadly launched VoLTE, 3G is here to stay for the time being. In some countries they'll sunset 2G, and in others they will sunset 3G. I read initially Telenor will sunset 2G, but I'm now reading they'll sunset 3G and retain 2G (or maybe I read it wrong earlier). While I personally don't agree with retaining 2G (which is so outdated), the rural population don't have phones that go beyond 2G, where Telenor earns its bread and butter from primarily.
That aside, I think they thought "Oh, 850Mhz? Let's space out the towers even more cause the signal travels far" - so some will be on 850Mhz, and some will be on 2100Mhz. Good mix of signals and coverage. In theory. What suffered in the end? 4G. Then CA with 1800Mhz meant decent 4G (in theory) and mitigate the low speeds. But the trouble is their signals just aren't good enough everywhere for data speeds (but good enough for 3G voice, not 2G voice) because of the interference / concrete / angle / tilts. I know Mobilink overhauled their network for both 3G and 4G hence the fairly consistent speeds. Telenor probably employed NSN for some reason.
Anyway, past knuckleheads in Telenor took wrong business decisions, current guys probably aren't able to meet their revenue targets (I suppose), can't justify further investment in network fixtures, and thus, are basically trying to save their face with whatever they have and grease the palms of the Europeans. I don't think this is working for them, which probably explains why their ads have toned down and either I'm not seeing them at all, or I've stopped watching TV altogether.
Now since 3G is being sunset in 2023 (sources below), as you said, they could buy Ufone, allocate all of 850Mhz to 4G, shift some 900Mhz spectrum to 1800Mhz and make it 15Mhz 4G (sparing some for 2G), and carrier aggregate the two 4G bands together. 5+5Mhz CA is actually enough and better than 10Mhz contiguous, as CA ensures higher combined speeds vs. one 10Mhz chunk of spectrum - Google it! And if they buy Ufone, they can dispose off 2100Mhz altogether to save costs.
If they don't buy Ufone, they could repurpose their 5Mhz 2100Mhz to 4G and have 10+5 for 4G, and use 1800Mhz and 900Mhz for 2G.
But for the love of all great things in this world, broadly launch VoLTE so that there's reduced pressure on 3G.
That's not the (user-facing) problem with Telenor - if you stand next to a tower, you get decent speeds even on 5Mhz, so bandwidth, seemingly, isn't the issue - they appear to have enough throughput from the towers, even on 3G. The problem is the signal propagation through buildings, trees and construction, affecting 2G, 3G and 4G. They've got these hifi cloud systems and what-not going on internally, but damn, their signal propagation (and quality) is crap indoors.
Sources for sunsetting:
https://www.emnify.com/blog/global-2g-phase-out
http://www.intlm2m.cn/upload/20181220224947.pdf
https://www.techuk.org/component/te...Real_Wireless_Report_for_the_UK_SPF_16165.pdf