Being charged more than agreed

[Coldste]

So I've signed up for a £10 a month sim only 12 month contract on the 30th of june, unlimited minutes and texts, and 60gb of data. But my first bill is £11 pounds is a mistake on o2's part? 

I've got a price cap on at 0 so I know ive not gone over anything 

[Enlli · Accepted solution]

Your first bill will be slightly higher as it includes the odd days between sign up and your billing date.

https://www.o2.co.uk/business/support/billing/understanding-your-bill