Oh ya, forgot to add. Delete your credit card and add his, and vice versa. If you want to change the account email address, it can be done but is a little convoluted:
1. Son gets temporary email address and changes his account email address to it
2. You change email address in your account to your son's email address
3. You change son's account with the temp address to your email address
@Luddite I think the point was to associate the less expensive plan to a different (specific) phone number, which right now isn't possible. I don't think swapping SIM cards accomplishes this, as then @gmd's son would end up with @gmd's phone number as well as plan. I don't think that was the intended result.
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