Hey Niki, welcome to Three Community!
Unfortunately, there's no way to view your itemised usage until your monthly bill is generated. That should happen on the same day your allowances usually refresh.
What is it you're looking to check? Your phone holds a lot of information itself, such as your call history and sometimes a summary of your data usage. That summary won't be as accurate as your Three bill of course, but it might help give you an indication of how much data you've used so far.
Let us know what you're looking to find out, and if it's urgent - we'll point you in the right direction for further help if needs be.
StephR
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