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How to increase my credit score
Do you have the option of paying cash for the phone? To answer your question though: Essentially, you have to use credit RESPONSIBLY. That doesn't mean go get a slew of loans and pay them off. As Ratish said, a credit card is a good start. I basically buy everything with a card and then pay it off every month when the bill comes out. I actually have two and I alternate but that's getting nitpicky. It should be noted that simply getting a card won't help your score. In fact, it may go down initially as the inquiry and new account opening may have a negative effect. The positive effect will happen as you develop good payment behavior over time.  One big thing you can do, in your case, is always pay your mobile bill on time. Having a good payment history with them will go a long way to prove you are responsible.