Every new activity you start can have an associated new next number.
For example if you have a field ticket or invoice that needs a new unique number for each new activity that is filled out FAT FINGER can generate this for you.
Start a new or edit an App Template
Open the top Title element advanced options dropdown
Activate - "NEXT NUMBER MODE"
Optional - Input your desired starting number. eg. 5000 if you want the next activity to start at 5000.