Iphone data usage is too high?

I had a samsung galaxy s3 before this phone and I had a 500mb allowance per month. I never got over the limit nor did I use it all up before the end of the month. Now I have an iphone 5c because my parents and my friends convinced me to get it and I have 2gb allowance per month. This phone uses about 200mb every day, and all I do on my data is listen to music on spotify for about an hour a day (30 mins to and 30 mins from school), go on fb for like 10-15 mins when I'm on the bus to school and on Sunday listen to music with data because I go out. But that's also only a 40 mins total. How come the data usage is so high? I'm really unhappy and trying to find a way to switch to samsung but I'll probably have to wait until the end of the contract. What can I do to lower the usage?

It's high because you're allowing background processes to access data and run continuously.

Go into your phone's settings and disable notifications for any apps that don't need them, or uninstall the apps altogether.

Spotify is going to use a fair amount of your data limit though. An hour of music at 320 kbps will equate to roughly 115-ish MB of data usage.

Your data usage depends on how you use the phone, not on the brand of phone. On the iPhone, open the Settings app, and look under Cellular to see your data usage. The amount of data used by each app is shown on a list.