If they are happy without Celcom, then they should just change to Xpax and subscribe to the RM35 monthly pass for unlimited data and calls.

However, service migration from Celcom postpaid to Xpax is not possible. So the only way is to port-out to another telco. At this moment Hotlink Prepaid Unlimited is probably the best proposition out there. Then subscribe to the RM35 or RM45 pass for unlimited data (FUP of 50GB) and calls.

If they are happy with Hotlink, then stay with Hotlink. Otherwise, you can help your parents to port-out to Xpax again 1 month later from your service activation with Hotlink.

Value Incredible Plan for our VIP Senior Citizens
https://www.tunetalk.com/my/en/vip

RM10 monthly plan comes with unlimited calls* and 2GB data**

*
VIP Plan – 2Gb and unlimited local on-net calls only (Tune Talk to Tune Talk calls) allocation for 30 days including the day of subscription and will expire on the 11:59pm on the last day.
Tune Talk reserves the right to temporarily block, suspend or cancel the subscription to the Plan or Service if Tune Talk has reasonable grounds that the Plan and/or Service has been abused, used or exploited commercially without Tune Talk authorization, fraud or against any law. (Refer to Terms of Service)

**
Should the data quota be exhausted before auto-renewal date, subscribers will be charged standard data pay-per-use rates unless subscriber renews or switches a data plan.
At 90% and 100% of the Data Quota utilization, a usage notification will be sent to the subscriber and remaining available Data Quota can be checked on the Tune Talk App (http://bit.ly/applTT) dialling *134#.

Value Incredible Plan for our VIP Senior Citizens
https://www.tunetalk.com/my/en/vip

RM10 monthly plan comes with unlimited calls* and 2GB data**

*
VIP Plan – 2Gb and unlimited local on-net calls only (Tune Talk to Tune Talk calls) allocation for 30 days including the day of subscription and will expire on the 11:59pm on the last day.
Tune Talk reserves the right to temporarily block, suspend or cancel the subscription to the Plan or Service if Tune Talk has reasonable grounds that the Plan and/or Service has been abused, used or exploited commercially without Tune Talk authorization, fraud or against any law. (Refer to Terms of Service)

**
Should the data quota be exhausted before auto-renewal date, subscribers will be charged standard data pay-per-use rates unless subscriber renews or switches a data plan.
At 90% and 100% of the Data Quota utilization, a usage notification will be sent to the subscriber and remaining available Data Quota can be checked on the Tune Talk App (http://bit.ly/applTT) dialling *134#.