BBM without a blackberry?

[Charlie]

Hi,

My wife and I both had BlackBerry phones and used to BBM quite a lot, but this weekend her phone died and she's got a Samsung now. Is there an app for her phone that will let her BBM me and if not (I assume not) is there anything I can download so we can instant message?

Only ever had BlackBerry phones so completely ignorant of all this stuff.

Thanks for any help.