How did T-Mobile add their stock ticker to my stocks app ??

    I just signed up with T-Mobile - I have an iPhone 6S I brought over from AT&T - it's my phone - I own it outright - when I looked at my stocks app this morning, I noticed that T-Mobile's stock symbol had been added to the list of stocks I watch - how the heck do they get off manipulating my machine like that without my permission ??

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