I have a iPhone with 100mb data?

Hi, I'm switching my sim from a blackberry to a iPhone, I have unlimited texts, 200min calls and a 100mb of data on Internet, is that enough and how can I not go over 100mb?

Only you can answer that. But, if you turn off network, it will stop you eating into your data and just turn it on when you need to. Remember you can use Wi-Fi at home if your phone supports Wi-Fi. It will connect to your home internet, so you don't eat into your data. If you update or download any apps - use your Wi-Fi connection at home.

You will most likely go over if you search the web daily, i suggest getting new sim but if not try to use Wi-Fi as much as possible and turn off 3G, location services, and all other data wasteing options.