A flip phone in 2013?

In my experience, flip phones are much more common in Europe and all points east. If all you want to do is talk/text they are actually a lot easier/faster for common tasks than a full 'smartphone'. Personally, I like them -way- better... smaller, more durable.

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there's a line where she says she bought another phone when she decided to become a prostitute. apparently she bought a cheap flip phone for her secret texts.

As 'qme4good' states, she bought a 2nd phone.
In 1 scene, you see Isabelle put aside her 'main' smartphone, and pick up the cheap flip-phone she used for her call-girl work.
It makes sense, as she only needs to text. You actually don't see her even talk with it.
I know a woman who does this work, and she does the same.

Flip phones rock!