Question : Does my router support ADSL2? (Linksys WRT54GS)

I want to switch from normal adsl (1,500kbps download speed) to adsl2 (24,000kbps download speed).

I have got Linksys WRT54GS working well now with the normal adsl... is it going to work well with ADSL2?

I have asked the ISPs but no answer from them......

Answer : Does my router support ADSL2? (Linksys WRT54GS)

The fact that you have a WRT54GS is not relevant here.  This is a ROUTER and not an ADSL or ADSL2 "modem".  To get ADSL2 you must contact your DSL provider and IF (and this is a BIG IF) they provide this server and IF your location permits it, THEY can provide you with this server and the equipment to do it.

The WRT54GS is still useful as it's an ETHERNER router and has nothing to do with ADSL.

You as the consumer cannot simply choose to use ADSL2.  Contact your DSL provider and get the details from them.