Last time, I shared the Way2Sms Mobile App To Send Free Sms but all of these free sms sites provide the limit of 160 or less characters. But there is a site from where you can send the free sms to any mobile in India upto 500 characters.

Send Free Sms Upto 500 Characters In India

You can send the sms using this service to any GSM or CDMA phone like Airtel, Vodafone, Idea Cellurlar, BSNL, MTNL, Aircel, BPL Uninor & Reliance etc. mobile users in India. Also, it does not include any ad in the sms being sent.
Visit the below URL to Send Free Sms In India Upto 500 Characters.