Life in Balance: Amit D. Chaudhary’s Blog
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The Palm Treo 650 (PDA\SmartPhone) has Quad GSM support which means it is capable of being used in India and other countries.

The typical Cingular Treo 650 is subsidy locked. This means, you cannot just put a prepaid SIM card in it and use it in India or other non-US country. The details about the subsidy lock are in the informative document on the palm website, How to use your Treo smartphone internationally

The way to unlock your Treo 650 is simple

• Call up Cingular support (611 on your cellphone) and ask for technical support

• Tell the person on the line that you are going outside your country and would like to use your cellphone there. Is there any way of unlocking it.

• All things being same(account in good standing), the person would ask for your phone’s IMEI number (Goto phone mode, then press *#06#)

• She or he would, after a small wait give the key sequence which in unique to each IMEI to unlock the phone.

• Type the key sequence and a message is displayed saying “Your phone is now unlocked”.

It is now ready to be used with any SIM card including the prepaid ones in India.
Image courtesy the palm website.

Update: In India, I tried a third party GSM provider (AirTel prepaid SIM card) and it worked well with the unlocked Treo 650.