A friend or a passers-by?

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About 3 months ago, I met a friend on-line because both of us are interested in English . We got to know each other from a QQ English chatting room and then since we both live at the same city we had a few chances to practise spoken English . At one time the friend sent me a message asking me to join a kind of service which enables him to send messages to me without any charge and I denied since I were not sure if I need to pay any money to the telephone company for registering for this kind of service and it's ususally true here. What's more I am a person who does not like to be a slave of mobile phones and I keep my cellphone usage to very basic functions and try to leave my life without its involvement as much as possible. I told him the reasons why I did not want to join and he was disappointed with me choice but persisted in sending me inviation of the same kind for a few more times without getting an approvement from me. He said something like you are stubborn and he finnally understood me and then stopped chatting with me on the internet for a long time . About 2 weeks ago, when I was playing Majhong he called my phone but hung up the call just after the phone rang 3 times. I were a bit confused over his behavior and could not understand his intention . Is he a guy worthes my time and friendship ? What would you guys do in interacting with him ?? Waiting for your imput!