How to use more than one WhatsApp in one android device

METHOD 1: use multi user on Lollipop
Phones
If you want to run 2 WhatsApp Accounts on One Android
Phone, you can use the Multi-User Feature offered by the
Android Lollipop Operating System, including Cyanogen OS
and other custom ROMs.
Follow these simple steps to begin:
Step 1: Add Multi-User in Android Lollipop-Based smartphone.
For this, just go to Settings and click on Users and then Add
User.
Step 2: Once after creating a new user, provide complete
details to setup a new user account
Step 3: Switch to the New User by pulling down the
notification bar and clicking on New User icon.
Step 4: Once turned to New User, you will be provided with an
all new phone interface with default phone settings.
Step 5: Now, Install WhatsApp in the New User Mode.
Step 6: Once WhatsApp is downloaded, enter all the details,
and that is it.



Method 2: to avoid this long process
Go to play store>search>parallel space and install> then follow the prompts