Looking for a free text app I can send text from my iPad or iPhone (on WiFi) to another iPhone on 3G or WiFi. Looked through various on the iTunes app store, some have SN integration, others have different features. Don't need bells and whistles, just text capability. Don't mind paying for one, anyone recommend or use anything that's good? PS: I suppose there's SKYPE that does this, but wanted something else. Cheers!