Can a Circuit Differentiate Between SMS and Telephone Signals?

[ToonBlue]

Homework Statement

I want to design a circuit that is able to differentiate an sms signal and also a telephone signal. What I mean is the telephone signal is when someone calls you.

Example , when someone sms you , your circuit will detect the sms signal and LED 1 will light up (use to indicate the signal) or when someone is calling you , your circuit will detect the telephone signal , LED 2 will light up

Homework Equations

The Attempt at a Solution

Can anyone give me some hints on where I can go about?

 

[jedishrfu]

How would you proceed?

What have you learned about so far in electronics that would help here?

Our site rules prohibit us from helping until we see some effort to solve your problem.

 

[ToonBlue]

I am not really sure which is why I am asking for some hints here. I am not asking that you help me solve my problem by giving me solution. I am asking for information on where I can begin searching for solution to my problem. for example some key term that might give me some clue to my answer