One problem I thought about that you might run into. FSC will not work on with IOS since it uses Silver Light. Also my IB account does not have charts with indicators for IOS.
I have no idea if TOS has an app that works with IOS. I would check that out or else you will be forced to sign up for SC. If you have a friend that has an iPhone, load a TOS app and see what happens. I used this process with my daughter's phone.
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