The phone app shows your extra usage and lets you turn it on or off.
See it
- Open Manage workspace for the workspace you are in.
- Scroll to Extra usage.
You see what is left, what you spent this month, your monthly cap and whether extra usage is on. In a shared workspace you see your own spending and cap, and the owner and admins also see the workspace's. The owner and admins can set the workspace's monthly cap and the default monthly cap for members in the same section.
Turn it on or off
Tap the Use extra usage switch. Extra usage that isn't a gift is used only while it is on and your monthly cap is above $0. Gifted extra usage is used either way.
In a chat
When a reply stops at your limit, the message can offer Turn on extra usage, Raise my cap or, in a shared workspace, Ask for extra usage, and says when your plan's usage starts over.
Read What is extra usage? for how it works.