Actually there is a way to send your incoming phone calls to your iPhone using your Apple Watch, which allows you to answer them later. If you’re not aware simply follow this article which provides the information about how to answer incoming calls from your iPhone using your Apple Watch.
On your Apple Watch, there are two features for handling incoming calls on your wrist worn device, which makes you to answer them later on your iPhone. Upon scrolling up on the Digital Crown, you will be able to find additional options like Answer on iPhone, or Send a Message.
Send a Message option that works like the Message option on the iPhone, while the Answer on iPhone option works by sending the call to your iPhone, which will place the incoming call on hold until you are ready to take the call.
In addition to the Answer on iPhone option, this feature is good for those that find their iPhone out of reach and don’t want to use the speaker on the Apple Watch to take the call. Not only will this feature place the call on hold on your iPhone, but you will also be able to ping your iPhone with your Watch. Upon pinging your iPhone, your handset will emit a sound so that you can locate it. After finding your iPhone, you will be able to take the call off hold and answer it.