Yes, it is possible to get WhatsApp on Nothing's "Phone (2a)". Here are the steps to install and use WhatsApp, including the option to have two separate WhatsApp accounts:

- Download the WhatsApp application from the Google Play Store and install it on your phone.
- To use two WhatsApp accounts, you can clone the WhatsApp application by going to Settings, selecting "Apps", then "Clone Apps". Activate the switcher for WhatsApp, which will create a copy of the application allowing you to manage two separate accounts.