I think this explains part of my problem as well.

When the phone is idle I get 3G and it's usually 3 bars and above.

The minute I open browser or anything internet related, it switches to H+ and the signal drops to 0-1 bar and becomes super slow. Sometimes to the point it drops me off the network completely.

Anyone can explain why this is happening?

During CNY or Raya time people go back hometown. There are not many cell stations but the population density increases. Thus this causes no line. The transmitter towers transmit into 3 sectors, Alpha, Beta and Gamma as some called it. In each sector, they transmits 2 or 3 channel. Each channel can handle 8 simultaneous calls (this is what I knew previously long time ago. So, things might change now, but basically this is how calls are multiplexed). So, limited number of people can talk at any given time. CS excuses damn stupid probably because they were told not to give bad image by saying their line congested 

I guess mobile users expand fast and telco barely can cope or probably they are just trying to maximize usage while minimizing cost. So, this is why you can say any telco also same. When many migrate to Maxis because so much bad news on Celcom, Maxis network get congested. Then Maxis starts getting bad name. People then migrate to DiGi, then Celcom. All these just like lalat 

Well this is what actually happen. I used to sell microwave radio for both Maxis and Celcom for tower connectivity. I was using Celcom and Maxis ask why use Celcom. I told them that the rural area where my kampung located has poor Maxis coverage. So, they just keep quiet  .

Was at Paradigm mall car park. Celcom has no signal at all whereas Digi has H+

Actually you can have 2 lines since Celcom offer is quite cheap. Personally I think Celcom vs Digi so far for me has been in favor of Celcom. Both has its downside definitely. Celcom has poor data coverage on NSE. Digi was unstable in some area in Kepong. In term of 4g coverage, seem like Celcom has better coverage.

First Basic 38, just signed up over the weekend. Waiting for port-over which may take up to 3 work days 

I just joined the RM38 club

Registered from one LYN forumer here. This morning register, paid RM 40.00 , received my service in 5 minutes. Maybe because i am existing celcom postpaid customer.

you are right, just got my activation done during lunch. Here's the speed in Kelana Jaya area;

The Celcom customer service also suck one..

Yesterday night after turn on my internet connection few minutes, my laptop internet connections should "Limited". After a few minutes, then suddenly can "Connected".  Lagi after few minutes, then should "Limited" connection.

It seems like the data internet is frequently disconnect few minutes and few minutes.

I call to celcom customer service, they just reset the port connections nia..
Although they already help me reset the port connections, the data connection still suck and tak boleh pakai punya..

one complaint though... I have 1GB data on DG, every month cannot finish. The same for years.. but with Celcom I have 3GB, and within less than a week, Celcom says I have used 70%.. I wonder why

I think this explains part of my problem as well.

When the phone is idle I get 3G and it's usually 3 bars and above.

The minute I open browser or anything internet related, it switches to H+ and the signal drops to 0-1 bar and becomes super slow. Sometimes to the point it drops me off the network completely.

Anyone can explain why this is happening?

haha ok la..my last time was almost 10 days coz problem between the telco
thanks good to know
humm not bad right?
sometime could be the laptop wifi thing..or your mobile have apps running...one thing for sure if share from phone..the battery die very very fast..that's why prefer to find free hotspots to work in public places
  what did you watch or download ah...though I am the master..4GB within 3 weeks..you less than a week 

My thoughts on Celcom's network -

1) Internet speed and connection outdoors are a lot faster and more stable than indoors. I can barely get good connection indoors especially at home and in the office. I guess they are trying to compensate slow indoor connection with their Celcom Wifi but the wifi is not available everywhere.

2) At least 30% of the time the internet just doesn't work even with full 3G/H connection. Either wait and try again after 3-5 minutes or turn on/off airplane mode to get back proper connection.

All of this are problems I haven't experienced when I was with Digi or Maxis but I guess I just have to suck it up with the price for what they're offering.

Previously was using Hotlink, my coverage was always full bar either at home or at my office.
Then ported to Celcom Basic 38, in the office or at home coverage sometimes full bar until I can get LTE, sometimes 0 coverage.

The good thing is it's cheap, but the downside not having coverage at all is pissing me off.
Kalau outdoor mmg takde masalah. Celcom......

that's the thing.. no habit to watch or download anything.. else i would use up DG's 1GB data every month.. but for years, every month i hv a lot of mb not finished on DG's mobile data. however, suddenly with celcom, they tell me i hv used 70-80%

no coverage?? where you stay la? very rare with no coverage lo...even at east coast still got signal

where you stay la...
sometime low connection could be due to other factor like weather, maintenance etc lo...just like astro..hujan no signal at all 
for outdoor most telco is ok la..
also sometime it could be due to phone problem also..can try on other phone to see how..share the speedtest here as reference for everybody ya..TIA
no coverage?? where you stay la? very rare with no coverage lo...even at east coast still got signal
careful with the LTE coz speed very fast then data quota also finish fast haha
last time on 3G ma but now on 4G..download very fast and that's why quota also cepat finish hahaha..
better check if any backend apps is running or not

4G is LTE? my phn GT-i9500, not GT-i9505, S4

the speed fluctuates la sometimes

even middle of KL town boleh dapat E signal aje..while previously on Celcom prepaid xox, never had such issue, always on H+..

so far my speed is ok,the download speed is quite fast..
never face any problem when download songs..