All this happens when your target phone do not have internet connection. If you send SMS Command (I.e, x9f9p9 LC 1) to retrieve location over SMS,  Location link will be sent back on the same number from where you had sent command even your target phone never connected to the internet SMS command will help you to find location of target phone. For example, if you have defined SMS Command as below Command : x9f9p9 LC 1