Yeah, you need to pay RM 80 (DG 50+ RM 30 postpaid supplementary line).
Commitment fees are where if you use lesser than the committed value, then you need to pay full but if you use more than the committed value obviously you have to pay more.

First and foremost, you must ensure that your sister is using DiGi I Heart Savings postpaid plan and she must at least using DG 50 and above. Then, after clarification, if I'm not mistaken both you and your girl need to go together with your sister to the nearest DiGi Centre and register for a plan called DiGi Family Plan. By this, you and your girl only need to use at least RM 15 per month and get all the free unlimited calls/SMS/MMS/video calls.

Yes, because the system will auto-reload RM 15 each to both of your prepaid accounts. The auto-reload date can be chosen, if I'm not mistaken there are a few days for users to select. Maybe both of you can pay back to your sister later?

It depends which Hotlink plan you are referring to, if it is Hotlink Youth Club and DiGi prepaid plan, then I say both have their own advantages. But if you comparing normal Hotlink plan and DiGi prepaid plan, I must say DiGi prepaid wins big time. Here is the prepaid plan: http://www.digi.com.my/prepaid/callplan/index.do

I don't face with such problem though.

I haven't really gone through BB plan yet, give me some time I'll digest the content later and see if I can help to answer your query. However, if anybody knows the answer, kindly answer to this query.

No longer being offered. For now is RM 30, it is a fee and not credit which means RM 30 will be deducted from your credit as a fee.
Nevertheless, in order to subscribe to this long life plan, you need to switch to the latest prepaid plan. The details of the plan can be found here: http://www.digi.com.my/prepaid/callplan/index.do

I think it is possible if you register separate accounts for both main and supplementary line.

I'm ain't expert. But... 3G Unlimited plan has nothing to do with Windows Live Messenger because you need to subscribe separately for that.
And not all phones support for WLM.

Which Malaysian doesn't like free things?

Below 21 also has lower credit limit.

Thus, I only use 2G on my phone for voice and SMS. I can get full bar of 2G on my phone but 3G is not that stable, sometimes only 2 bars. Only use 3G for my Internet because can lock the speed to only 3G.

You can just select from your phone, network settings and only choose GSM.

Yes, possible.

Yes, for prepaid plan. I think postpaid also has because I remember the CS asked me if I want to choose RM 5 for unlimited access when I activated my 3G.
RM 5/day.

My phone is locked to GSM because 3G is not that stable on my side, I'm quite afraid of drop calls.
On contra, my DiGi Campus SIM card is locked to only 3G for faster surfing speed.

Yes, same as me.

I'm using ZTE MF 622, modem provided by U-Mobile.

Yea, smooth and steady.
For both EDGE and 3G.

Excuse me, do not start a flame war here. Else, I'll warn these accounts accordingly.

Not only DiGi EDGE, DiGi 3G broadband too. I noticed that happens on mine.

Sucks as in connection speed? Or how?
Where is your location?

12.01 a.m. is the new cycle.