You can forward your Skype audio calls to your mobile or landline. That way, if you do not have Wi-Fi, you'll still receive calls, and you do not have to worry about being logged in to Skype.
If you've ever missed a Skype voice call because you did not have it If you have Wi-Fi or are not signed in, Skype's automatic call forwarding can now fix it.
Enable Call Forwarding in Skype
On the Call Settings screen, press the Call Forwarding & Voicemail button. From there, activate the button next to "forward calls to". Here you can also specify how many seconds Skype should wait before forwarding your call. In this way, you can answer a call via Skype, if you can, before it is forwarded to your phone.
Make sure the "A mobile or landline number" radio button is selected, then select your country and enter your phone number. No telephone confirmation is required. Now the Skype forwarding has been established. Whenever you receive a video or voice call through Skype, the sound of the call is automatically forwarded to your mobile or landline!