What are things I can buy with my mobile phone?

I always get heaps of credit that I don't really need, so I'd like to buy things with it. My brother sometimes buys Habbo credit off his mobile, so atm that would be the only thing I know how to do. Is there anything else I could buy and pay with my credit?

Thanks in advance.

Viper.

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What phone do you have? I'm sure if you have a data plan or a web browser on the phone you can buy whatever you want.