| If you meant that options that depend upon NFC reduce the competition for those already owning an iPhone, then you make a good point, but of course the other options then become a factor in the consumer's next phone purchase decision. Also, iPhone penetration then becomes a crtical issue, if they're relying on their base to support the payment's system's adoption in retail establishments. 
 Yes, that was my point. None of the options you mentioned are currently available to iPhone users, none of them except iPayments will be available to iPhone users in the near future, if ever. If someone can roll out a payment service that can succeed despite ignoring the iPhone constituency, maybe you are right-- it could make the iPhone ecosystem look less attractive in comparison and negatively affect purchase decisions.
 
 For now, these all look like niche products that are fighting for table scraps. In the US, I don't think a service or app can ignore the iOS user base and have any chance of success. Has anyone ever done it?
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