Thanks for your advice. But I have no issue with Maxis. Why i port over because of the Maxis plan is too expensive.

I was at ground floor at Setia walk (Puchong) and Internet line was E only. Even in my landed house, the internet also E sometimes.

My office is located at 4th floor only and not other higher building that cover or block this area. If you say it cover by building and it will drop but why I go out from the building and everything is fine? And problem is, why it only happen few day at once and normally it was fine. It is frustrated if there is no service when I need to use the Internet. Now, once i switch on the mobile data, the line will drop. If no mobile data, then the line is fine.

If you said the signal tower is too far away, and this is thing that they need to enhance which add more signal tower to make it stronger.

digi the tomorrow network upgrade take 2  years to finish. now it celcom turn.
http://www.digi.com.my/tomorrownetwork/

I want to share my experience being a Celcom user over the year.. At first it was Ok - Where I work in KL (Along Jalan Raja Laut, around Chow Kit area) at first was getting stable 4G reception with decent speed (I realize that I don't get full 4G speed, but ok la, no need so fast pun)

Then over the months, I realize the network was getting crappier, yes I still have 4G network connectivity (according to my phone and wifi dongle connectivity-icon), but there's no data movement at all and I have consistently more than 3GB of data quota every month (inb4 data sudah habis la mang).

Then I decided I should just switched to the lower preferred network settings, 3G and it's still the same. The connection + speed (the speed deteriorates badly too) is so lousy. I would port out to other telco, if there were any cheaper with better benefits.

Btw I do have umobile, and it fairs better Celcom in terms of coverage in the city (KL/PJ) but kinda sucks in the new mall where there's no telco network booster/repeater or strong tower coverage..

think gonna ditch this plan in few days time..

coverage not constant..even 4g, cant even load page...in USJ, 4g area also the same...

I'm with Celcom since 2008... drop call is normal with celcom... but now many issue with celcom even after they SMS for infra upgrade in my place...
- drop call (normal issue with celcom)
- Slow 4G this year 2016 is worst celcom speed compare to last 2 year in LTE speed
- drop signal from 4G to 3G, H+ till H(never had this issue last year)
- all of my location celcom data speed, call drop & line drop is getting worst( Setapak Sri Petaling Shah Alam)

Gonna change to other telco later

usj..nearby honda...

btw, at home even worst..no signal at all for 2g...3g n above ok...few phones for backup using old nokia.. complaint to them since 2013...until now...nothing...2g totally no coverage

well i sure hope it'll be better after september, that's why i haven't quit on celcom just yet

i hope that too.

most of incoming and outgoing calls will be failed.

got full bar H+ but the data is not stable, sometimes no data at all

doing online banking which requires TAC no. need to attempt few times only can receive the SMS

saw celcom website..

the upgrade schedule till 29 Sept 2016..

hope that would the the last date.. after that no more..

Problem with celcom is even those areas not under the upgrade project is also affected. Speed is horrible, and I'm not those who check with speedtest. I can tell just by normal browsing on the phone, and guess what celcom didnt even bother to retain by calling or smsing. Nothing from them when I ported out.

Certain areas in Klang Valley after modernization is superb lo. Like Kepong for example, the whole Kepong, Bandar Sri Damansara, Sg Buloh the speed is super awesome there. Others I not sure. Previously, the speed is really horrible. Previous Celcom user.

Wah u mean got more upgrade after September
If like that gone case lor...

From the Celcom 4G Modernisation Page FAQ:

The rest of Malaysia outside Klang Valley can take a hike.