Yes, your smartphone is making it easier to spoof a real website and thereby gain entry to your operating system. From there, it's a short jump to a key logger program that copies all your visited sites, your cookies, your apps, and all your keystrokes. ( read "password")
A great read" here" about the way the small screen and the great fake websites are hard to see the URL of where the email or webpage originates. This just adds to the problem of phishing and then hacking.
So if you have ignored the warning of using your smartphone for financial dealings, then please read this and learn about how you put your assets and your identity at risk due to the ubiquitous use of smart phones and the trust people put into their security.
And you were just worried about the SIMM card swaps.