Call forwarding is telephony feature which redirects your incoming calls to any other alternate number which my be landline or mobile phone, where the desired called party is available.
You can use this feature of call forwarding in any of the land line as well mobile phones like legacy, Android, Apple and Windows.
This way you don't miss out on any important incoming calls. Calls can be diverted when you are busy, unavailable or travelling.
Call forwarding to landline or withing the receiving mobile's telecom operator can be FREE
Important to note: The call can be diverted to any landline or cellular within the service provider's network area and its free. Calls cannot be diverted to a cellular of another service provider.