Do you feel they are confusingly similar when used in context?
"I have my cellular service with ifone"
"I love my new iPhone"
"ifones service sucks"
"The iPhone sucks"
Even in the last two comparisons, conversationally, I don't see anyone being confused. Apples product is large enough it is a household name now. That helps disrupt that confusion. Conversely, were Apples product not well known, this would just go under the radar and no one would be confused either.
I understand legally you must protect you trademark, though in this case I'm seeing it as falling into the clause of "if those marks offer identical or similar offerings".
IANAL but doesn't one being a product and one being a service pretty much nullify the need to protect or defend the trademark on either side? That's how I'm seeing this one.
Now, were Apple to purchase a telco, that would change everything for me, even if they kept their new shiny telcos name as it previously existed.
I did read Apple started a new wireless research division. Perhaps one day we won't all be tethered to mandatory text messaging fees and bandwidth rates that are truly extortion in my opinion.