I have an iPhone 5s for over 5 months and on the first day of my cycle I see 20MB usage already. This has been happening for at least the last two cycles since I started paying attention. I've been using "My Data Manager" to keep track of my consumption and the Koodo Selfserve is always 20MB off to my disadvantage. I also reset the data in the Settings of the phone and manage which apps are using data, including keeping tabs on the "System Services". I still cannot explain how I can start the month with 20MB already in, which for a small plan like mine seems like a lot. Just wondering if this is a common practice and larger plan users just don't notice.
Appreciate the help.