IMessage - No SIM - Other Devices?

I have a jailbroken iPhone 4 with the SAM unlock in place, to fix iMessage and Push. I've never put a SIM card in the thing, and never plan to. After much dismay, (thinking the SAM fix wasn't working for iMessage), I found that it did work, but only for other iMessage users (I assume this because I just texted my own address and it worked).

Is there a way for me to be able to text other devices not running iMessage using this (or any) method?

The standard Message app depends on SMS messaging, and so requires a cell-phone subscription. However, you can use service apps like Skype or Viber to communicate over standard Internet connections. For example, Skype lets you send and receive SMS messages under certain conditions (and for a fee).

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