hi, follow the steps below:

Step 1-Ensure that your Android phone is synced with your Gmail account. Step 2-On your iPhone;select Settings,Choose 'Mail, Contacts, Calendars' Select 'Add Account' Finally, choose Microsoft Exchange. Step 3-On the next screen, enter your details into the following fields. Email and Password, Then select Next. Step 4 -On the next screen, enter your details into the following fields.

Email: this should be pre-populated with your Gmail email address
Server: m.google.com
Domain:leave this field empty
Username:
Password: this should be pre-populated with your Gmail password
Description: this should be pre-populated with your preferred label e.g. 'Gmail' Then select Next.

Step 5- Next,choose which aspects of your Gmail account you would like to sync with your iPhone by switching each On:

Mail
Contacts
Calendar

Finally select Save and press the home button.

Good Luck!