<i>Given Android devices far outnumber iOS devices, this may pose a problem. Other services like PayPal and Square are universal services (device agnostic), and accounts are free (compared to Apple&#x27;s barrier to entry which will likely cost you an iOS device).</i><p>In the US, where this payment service would likely be available first, the iPhone has a marketshare of around 44% and growing. So the difference in marketshare is in the single digits: <a href="http:&#x2F;&#x2F;www.macrumors.com&#x2F;2015&#x2F;09&#x2F;03&#x2F;iphone-us-market-share-comscore-2015&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.macrumors.com&#x2F;2015&#x2F;09&#x2F;03&#x2F;iphone-us-market-share-c...</a><p>Apple sold 74.5 million iPhones this quarter a year ago; they could sell even more this year, given the start the iPhone 6s had this year (13 million) vs. last year (10 million) during the first weekend of availability. If this keeps up, iPhone marketshare could surpass Android in a couple of years or less.<p>Second, just like with iMessage, Apple could differentiate between iOS users (blue bubbles) and non-iOS users with their green bubbles. Yes, this is a real thing: &quot;It’s Kind of Cheesy Being Green&quot; <a href="https:&#x2F;&#x2F;medium.com&#x2F;message&#x2F;its-kind-of-cheesy-being-green-2c72cc9e5eda" rel="nofollow">https:&#x2F;&#x2F;medium.com&#x2F;message&#x2F;its-kind-of-cheesy-being-green-2c...</a><p>The easiest thing for users would be to include payment in iMessage, similar to what Facebook and others are doing with their messaging apps.<p>Blue bubbles only. ;-)