Google Assistant is a personal voice
assistant developed for Android devices and was launched last month to compete Apple’s Siri. Google Assistant is also available for
iOS users. 
You can download Google Assistant app from the AppStore but what if
you want to replace your default siri or voice control to Google Assistant on
your iPhone running iOS 10 or higher.
You can use the Google Assistant on iOS
to do general stuff like Make quick phone calls, Send text messages, Send
emails, Set reminders, Set calendar events, Play music, Navigate to place and
more. 
Well you can replace your voice assistant Siri and use google assistant as default instead of Siri on your iPhone/iPad only if you are jailbroken on iOS 10, 10.1.1, 10.2.
Image: Mockuper.net
Well you can replace your voice assistant Siri and use google assistant as default instead of Siri on your iPhone/iPad only if you
are jailbroken on iOS 10, 10.1.1, 10.2.
You need to press and hold the home button
to access google assistant same like as Siri. To make more convenient that
using an google assistant app you can replace Siri with google assistant on iOS
10,10.1.1 jailbreak.
How to Replace Siri with Google Assistant
on iPhone in iOS 10
You can only replace your default Siri
or Voice control with Google Assistant completely if your iPhone/iPad is
jailbroken on iOS 10,10.1.1. 
With Activator, you can make Google Assistant as
default voice assistant which function same like as Siri. You can do lot more
things on your iPhone  from Activator.
If you want to use Google Assistant as
your default voice assistant instead of Siri on your iPhone/iPad running
iOS 10 or higher, simply follow these steps;
Follow these steps to replace your
default voice assistant Siri with Google Assistant on your iPhone
Before you begin, go to Settings app and
tap on Siri >> Toggle off the switch to disable Siri completely.
Well you can replace your voice assistant Siri and use google assistant as default instead of Siri on your iPhone/iPad only if you are jailbroken on iOS 10, 10.1.1, 10.2.
Step 1: Download Google Assistant from
the App Store and Activator from Cydia.
Step 2: Now Open the Activator Cydia app
from the Home screen.
Step 3: Tap on Anywhere option from the
list.
Step 4: Under the Home Button section,
tap on Long Hold.
Well you can replace your voice assistant Siri and use google assistant as default instead of Siri on your iPhone/iPad only if you are jailbroken on iOS 10, 10.1.1, 10.2.
Step 5: Scroll down to the User Applications
section
and under Google Assistant option,press on the ” i “button and select
‘Open App Immediately’.
That’t it! You have successfully
replaced Siri and made Google Assistant as your default voice assistant on iOS
10 jailbroken iPhone/iPad. 
Now when you press and hold the Home button, it will
open Google voice Assistant as default instead of Siri.