There are 3 types of decoder boxes in use now.

1) Astro DMT decoder box
2) Byond decoder box
3) Byond PVR decoder box

That SIM card is called SmartCard.

Answer...

For (1), yes you can take the smartcard from one box to another one (1) and use it.

If your old decoder is really very old such as those first generation Philips ones that were used in 1998, you may have problems because of the old software that cannot be updated and not enough internal flash memory to store the new software. Many many years ago, I remember that Astro changed all our older decoders to newer ones which have more internal EEPROM flash memory and different chipset. I am not sure for the 1st generation box because I have already replaced my one to newer generation decoder box.

I am not sure but I think it should be okay if the old decoder box is from later years such as in 2006. Just be careful if you have the old first generation decoder box. I cannot help you much as I don't have photo of the 1st generation box. I am not sure so I may be wrong but I think those old decoder boxes that used the "red coloured" smartcards with the old Astro logo are the ones... I think when Astro change this smartcard, the decoder box was also changed.

For (1) and (2), the answer is 100% NO !

The smartcard for Byond and Byond PVR have unique serial number that is combined and locked to the serial number of the decoder box so you cannot switch and interchange the smartcard on different (1) and (2) boxes.

Also... NEVER take the smartcard from (1) and use on (2) or (3)... of course also must take from (2) or (3) and use on (1) ! You may cause damage to the decoder box or the smartcard.

I have both (1) and (2) boxes with active subscriptions. One of my sisters who came to stay with my parents during chinese new year have (1) and took her smartcard and used on my (1) box because she subscribed to Sports Pack and I don't. No problem, can watch.

You mean... take your Byond decoder box + its own smartcard together to another location and use with a different old LNB+old satellite dish which was previously used for the old Astro DMT box.

Honestly, I have not personally tried it myself. From what I have previously read from a few other websites... yes is the answer.

I believe that this question have been asked a few times here before, so I searched Lowyat.net and found these links...
http://forum.lowyat.net/topic/1442797/+2194 ... refer to post 2195 from rewlie with replies from eMKs and Neb.
http://forum.lowyat.net/topic/1358482/+17 ... refer to post 19 from isma45 and reply from Neb

Neb is right when he mentioned that the old first generation black Philips LNB cannot be used for Byond box. This is similar to what I have told you in my previous reply about the old first generation Philips Astro DMT box which cannot use the new Astro DMT smartcard.

Different LNB (Low Noise Block) have different specifications so not all types can be used for Byond especially when the LNB is very very out-of-date. Technology changes so LNB design and specifications also changes.

Previously, I did read about such questions just like yours from a few other websites but I can't remember which websites. I am a bit lazy to google search again, hehe.

I believe you already knew that using the old LNB and old dish together with old satellite cables can reduce or degrade the signal reception to your Byond box and therefore, may cause some problems to the SD and HD channels reception.

If you have not been using the old LNB+dish for a very long time, maybe the old LNB is out-of-alignment, or LNB is spoilt or loose connection at LNB... so please check and correct this. If the old LNB is spoilt, then you need expert help to get replacement! Oh... due to constant wear from weather, the old satellite cables can also deteriorate after many years so signal loss is greater.

Also, the old light-grey dish (60 cm diameter) is slightly smaller than the new black dish (65 cm diameter) used by the Byond box. Using the old dish can also reduce the reception quality slightly.

Reminder : Cannot use the first generation black colour Philips LNB. If you have it, replace this and keep the old one in your personal museum, hehe.

I hope anyone here (who have actually done it successfully) to post your reply here to add more "yes" confirmation.

Although I have not done it before, this is the best I can do to answer you.

Peace 

ADDITION
Here are 2 links which tracks the 2 MEASAT satellites orbiting the earth...

MEASAT 3 > http://www.n2yo.com/?s=29648
MEASAT 3A > http://www.n2yo.com/?s=35362