Go SMS Pro sending messages over Wi-Fi?

I've tried to read up about Go SMS Pro because I'm going to be switching from an iPhone 4S to a Galaxy S5 tomorrow and I want to find a texting application that I will be able to use to send messages not only using my regular messages when I'm out, but also when I'm on Wi-Fi I wanna be able to send them on that as well like you would if you had iMessage! Now it doesn't have to be like iMessage but my girlfriend just got her iPhone 5C but I decided I didn't want an iPhone this time but a Galaxy, so we won't have iMessages anymore. But if I'm somewhere without service, but with Wi-Fi I wanna still be able to message her on the same application with my phone number! Can Go SMS Pro do that? Or are there any other apps out there that can?

Remember to turn off both iMessage & FaceTime before you pull out the sim card.

To turn those off go to Settings>Messages>iMessage to Off
and same for FaceTime

Also remove your iPhone from your iCloud account by going to icloud.com

You both can use Viber

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