I read that in India you can only send 200 texts a day. does anyone know if there is a cap in the US?
Several phones allow caps in text messages. Try the button that switches to big letters (it may look like "ABC")
As crazy as it sounds, the best people to ask would be your wireless provider. Can't stop laughing at this, though : http://www.phonearena.com/news/World-Record-texter-sent-566607-messages-in-one-month_id26815
I can't imagine there is any sort of cap. I have a teenage sister and I wouldn't be shocked to find out that she averages 200 text messages a day. And if not, it's probably just because she spends seven hours a day at school. She pretty much has a constant text conversation going on with several people all day, every day.
unlimited means unlimited. Carriers process millions of text all day, if not every hour. I don't think any one person can burden the system that much.