WCDMA v. HDSPA v. UMTS

[beppe_bl]

Originally Posted by snidely

I know a WCDMA 2100 phone is needed to work in Japan. I read on a couple web sites that HDSPA is an advanced version of WCDMA and is backwards compatible with WCDMA.

1- My question is: Is a HDSPA 2100 phone usable in Japan?

2- Am I correct in stating that all WCDMA phones are UMTS but not all UMTS phones are WCDMA?

Thanks for any light someone can shed on this.

...mike

1- yes, because hsdpa on umts as like as edge on gsm network

2- no, wcdma is the core technology of the umts, so is pratically the same to say wcdma phone or umts phone
(read http://www.gsmworld.com/technology/3g/faq.shtml )