Not really about online purchasing that I'm worried about. I have purchased online in more than one occasion so I am comfortable with that..
More like, I want to be sure it works on my iphone first and also whether the phones they have in the airport may be better to rent (such as a no data capability one so that I wouldn't run the risk of racking up a huge bill when my iphone connects all of a sudden)
would they refund if it doesn't work? or maybe in case it doesn't can they deduct the amount I paid online and let me get a rental phone instead of the sim? i hear refunding isnt a customary practice in japan.
thanks so much godwine and spicytuna.