Your phone is using data in the background, whether it is to update apps, provide you with weather reports, positioning and tracking for maps etc. There are so many data based services in smartphones that use data.
If you do not wish to use any data then please disable / uninstall these apps on your phone, or turn off mobile data in your phone settings. It is also possible to turn off mobile data in your account - at network level - but this may prevent your phone from operating correctly.
When a connection is logged on a mobile network, the user is verified in three stages. It logs the unique 20-digit SIM card number, the unique 15-digit IMEI (international mobile equipment identity) number and the unique IMSI (international mobile subscriber identity) number. The evidence we have examined shows the usage on your handset was logged and recorded through the mobile network. If this was not the case and your phone was connected to Wi-Fi, there would be no evidence of any data connection via the 1pMobile network. In view of this, we are unable to dispute the charges on your account.
For security reasons, we are unable to clarify how the data was used, but when the mobile data is switched on via your device and you have the correct APN settings for your provider, your phone is able to connect to the mobile network for data automatically. May smartphones do provide a breakdown on how data is used, and by which apps and features, in the settings area.
Smart phones by their very nature are setup to be constantly connected to the internet, and many apps and software on the phone would try to connect automatically for updates. May customers believe that when at home the phone should have been connected to Wi-Fi, and they had no intention of using your credit to access the internet via the mobile network at that time. Although they may not have intended to access data on your phone in this way at the time, the evidence and logging, as stated above, suggests the phone was connected to the mobile network, and the usage and associated charges would therefore valid.