Can someone please explain this expression.

[johnsmith1]

I was watching FNN news recently, something about the dangers of using your mobile (cell) phone to buy stuff, and came across the following expression in one of the news reports:

しかし、このモバイルSuicaに、ある落とし穴がある。
JR東日本には「身に覚えのないSuicaの利用明細が届いた」という苦情が相次いでいるという。

The first line, it says that however with mobile Suica there is a pit fall, but I don't fully understand the bit about some warning in the second line, especially the "身に覚えのない" bit. If anyone could please explain, thanks.