It is good to read the FAQ Celcom here.

300Mbps CELCOM HOME FIBRE™

What is 300Mbps Celcom Home Fibre™ campaign?
It’s an initiative to provide existing postpaid customers with an internet connection via Home Fibre service with RM40 discount on the monthly fee for the first 24 Months of their subscription to the Home Fibre 300Mbps only.

When is the launch date?
19th September 2022

Who is eligible for the fibre 300Mbps campaign?
Customers must fulfill the criteria below:

New Celcom Home Fibre™ registration with 300Mbps plan
Fibre installation address within all access partners
Postpaid plan customers with value of RM80 and above

What are the benefits for customers participating in this campaign?
Customers will enjoy RM40 discount from the monthly fee for the first 24 months upon subscribing to Celcom Home Fibre™ 300Mbps plan only. Customer will also get a Home Fibre connection with a premium modem.

How much shall customer pay during the subscription period?
Customers only pay RM100 for the monthly fee for the first 24 months. From month 25th onwards, the customer have to pay the normal price of the plan RM140.

How does customer know if they are eligible for the offering?
Customer may visit to any nearest Celcom bluecube, Celcom Certified Partners or check their coverage checker at Celcom Official Website to check on their eligibility. Additionally, this offering is subject to areas where Celcom Home Fibre is serviceable.

How does customer subscribe to the offer?
For subscription, customer may walk in at any Celcom bluecube or Celcom Certified Partners.

Is there any deposit fee?
The deposit fee of RM500 is only chargeable to non-Malaysians and is to be paid upfront.

Is the deposit fee refunded to the customer?
Yes. Deposit fee will be refunded upon service termination.

Does the subscription come with a contract? 
Yes. Celcom Home Fibre plan comes with 24-month contract from the activation date.

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sos: here

I have registered with an agent from facebook named Derrick. I don't have Mega plan. He said Mega Plan only need to use on first month then terminate. Fibre monthly fee will remain RM100. Transferred from maxis. I asked him to register me mega80 plan and he keep delaying and said it's okay if register slightly after Fibre installation.

6/12/2022 - Registered Fibre. Maxis counter offer me RM119/mth. The agent mentioned that I need to decline any offer from maxis or I will be charged register cancellation fee RM500. Not sure if it's real.
10/12/2022 - Registered Mega80. I walked in myself
13/12/2022 - 1st bill came in and it is prorated from Rm140 basis

I complained to him but he said next month bill will start RM100. But in Celcom Life App, in unbilled section which means upcoming bill still showing RM140. He keep on saying it will be RM100. Hoping he is not bullshitting me. Let's see the bill next month or I might file a complaint to MCMC.

Are you existing user of Mega plan? The Skyworth router is pretty good i think. Maybe the antenna positioning affects the range. My Pocophone F1 getting 200+Mbps anywhere in the house with 5 rooms. My family phones, did not get that speed thou. Maybe F1 have better wifi capability.

Yeah i chose to transfer to celcom also because of rm100. The only thing that sucks is I never get hold to the customer service on phone. I think i made call around 7 time this week. always busy and cut off the call. I want to ask for public ip. The CS in whatsapp cannot do detailed task and ask me to call 1111.

Just want to say thanks to the LYN Networking/Deals/etc. Sifus here. Am here to just share my experience for jumping ship from Maxis to Celcom Home Fibre.
Been browsing through LYN on Public Dynamic IP stuff as I received some RM10 charges on Maxis Public IP thing. Then all of sudden I saw some RM100/mth for 300mb/s deal for Celcom Home Fibre on the threads. Then I quickly browsed through Celcom's Website and walla, such thing exists wow. Thinking it's kinda good deal as I am an existing Celcom Postpaid user since the 90s, it would be easier management.

So basically, we just walked in to a Celcom blueCube store yesterday and requested for Celcom Home Fibre.

Things needed:
-Broadband Statement (PDF will do, they will provide you an email to send the Bill Statement to)
-IC of Celcom Principal Line

Then the staff will check on your Maxis Fibre account number to see what package you're subscribing to (with Maxis. Yes, TM backbone) and offered the Celcom Home Fibre plan. They told me since my Celcom Postpaid Plan meets the requirement for 300mpbs for RM100/mth, it is recommended to take that deal, there is a 24mths contract, though.

After a moment they generated a Transfer ID thing for us. We are required to visit Maxis Centres to request transfer. Do get the Transfer ID handy, keep a copy at least.

We thought everything's done. The Maxperts asked us to call Maxis Fibre Hotline at 1800-82-1230 and to mention "Transfer from Maxis Fibre to Celcom Fibre". Then we know this is the boss fight where they will counter-offer you. And yep, the personnel picked up the call and we mentioned everything to him. They did ask for the reason on what attracted us to jump ship though. And here comes the keyword, they replied: "As I can see from here, you have been using Maxis Home Fibre since 2013, it's been a decade. Thus, we would like to offer you 300mbps for RM100/mth, No-Contract to stay with us. Are you interested with our offer?"

In my mind was like wth if I don't ditch Maxis Fibre then you are going to charge me RM149 for another few decades right?  .

And yep, at the end the guy from the other end said "It's sad to see you go, I have APPROVED the Transfer Request. And there is a one last thing needed to be done from your end. Kindly pay an Advance Payment (excl 6% Tax), it is pro-rated and will be refunded once the transition has been done."

TAKE NOTE, very fishy. Since we are quite not sure how do we take back the refunds, we went back to Maxis Centre to get some info on this. Their Maxperts told me this:
"Once the transition has been done, the Maxis Account Number will be deleted. In order to receive the refund, customers are required to visit Maxis Centres and provide them IC to track back any Overpaid Amounts."
And today I have called 1111 (Hotline for Celcom Mobile users) to ask them check on the Service Transfer (get your Transfer ID handy). They replied:
[CELCOM]:From here I can see that your Transfer from Maxis to Celcom Fibre has been APPROVED. May I know which Celcom branch you visited yesterday?
[Me]: Celcom blueCube XXXX.
[CELCOM]: Did anyone from that branch called you?
[Me]: Nope.
[CELCOM]: Okay I have escalated this ticket to that branch. Their staff will contact you for Installation Matters and other stuff within 24 hours (minimum) time.

And yep, end of story for now. Will update soon on Installation stuff.