Technomancer spells can be opened by anyone and will be automatically when an email/text is opened. Note that directing the spell itself is not possible, it will simply cast immediately through the screen, so casting offensive spells may cause unintentional damage. Additionally, a stored spell continually draws a small amount of magical energy from the technomancer to keep it in digital form, so it's not an infinite route to casting all magics from your phone. A couple at a time won't be noticeable, but mass use could result in rapid energy loss and even basic spells malfunctioning until some of the spells are released.
Additionally, while anyone can open a spell sent by a technomancer, technomancers can only send their own magic, not someone else's. They don't have any control over other peoples' magic, so they can't send it.
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Additionally, while anyone can open a spell sent by a technomancer, technomancers can only send their own magic, not someone else's. They don't have any control over other peoples' magic, so they can't send it.