Vodafone UK have been pretty quick of the mark with this one. My Vodafone is now available to download from BlackBerry World and if they are your network of choice it's one app you should really have on your BlackBerry 10 smartphone.
Whether you are a Pay-As-You-Go customer or Pay Monthly you will be able to see the credit or allowance you have along with specific information about your price plan. If you are worried about exceeding your monthly allowance then just hit up the app and check how many text messages or megabytes of data you have used so far - perfect.
My Vodafone is free to download for UK customers - I would urge you go grab it now.