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Using more of your Mobile Data Allowance than normal ? - My Guide.
iOS > Settings > Mobile Data> scroll down to see the list of apps under Use Mobile data for. Toggle off anything that isn’t necessary for your needs.
Android > look under Settings > Wireless & Networks > Data usage and tap on an app to find the option to Restrict app background data.
Smartphones have stock mail apps preloaded.
Then alternative mail apps can come downloaded.
You should be able to look in the stock mail settings and possibly delete your gmail settings from there or remove the 3rd party app.
It sounds like they are syncing.
This was happening on my iPhone so I deleted the downloaded 3rd party mail app.
Regarding the settings.
Double check your settings for email in the stock app or 3rd party mail app. . It maybe that this feature isn't available to your phone.
After realising to my embarrassment that an app was doing a major update over a train's wifi, I discovered an additional setting to control Android phones' use of data.
Within the Play Store app, go to Settings, and there is one that controls auto-update of apps - the options are:
Do not auto-update apps
Auto-update at any time
Auto-update over wifi only
I had mine set to the third, until I accidentally breached the wifi rules on the train. Now I have it set to the first, and limit my updating to when I'm safely using the home wifi.
Fortunately, nothing happened! However, I hastily turned off wifi, as I had given my name and email address as part of the sign-up process, and I had no wish to find myself blacklisted by Virgin East Coast for excessive use of data. It's a long journey up to Edinburgh, and I make the return journey at least once a year, so their wifi is a useful service. Of course, I do have alternative email addresses, but life gets very complicated if you have to keep track of which address you can safely give to which organisation....
Interestingly, I had an email from them a few days before I travelled, reminding me to take my tickets and railcard ** That explained that it was now possible to watch movies during the journey, but that it was essential to download and install their app before travelling, as it wasn't permitted to download it over their wifi.
I did wonder a bit about the relative bandwidth requirements for watching one of their movies and for installing their app, but I guess it's about no one individual overloading their system. [Edited to add: and of course the movie is already onboard, while the app would have to get from the outside world onto the train.] So I installed the app before my journey with every intention of watching something, but it was a beautiful day so I watched the scenery, and hastily turned off my wifi when I realised my phone was breaking the rules.
** I suspect that the excessively laidback style of their emails confirming ticket purchase has resulted in a rash of people turning up with nothing more than a booking confirmation. An odd mistake from a group which runs a successful airline!