1. Nokia 5110 (it is an older model Price: Rs.2500/) can be used for that purpose with DAU-9P cable .
It is not data enabled by default . That is it doesn't have built- in
modem . But a software modem can be used .
Install Nokia PC Data Suite 3.0 in Win98. Software modem will get installed automatically.
2. You can use 6210 or any other costly phone with built in modem . For that you need not use Data Suite.
Please refer to senior's reply to my questions (ramu_sms)