Step 1: Tap Settings
Step 2: Tap Accounts & Passwords
Step 3: Tap Add Account
Step 4: Tap Exchange
Step 5: Enter your email address and tap next
Step 6: Tap Configure Manually
Under Server enter m.google.com
Leave Domain Blank
Under Username enter your email address
Step 7: Tap Next
Step 8: Make sure all the sliders are green and set to on, tap Save