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EasyRoam also deals with text messages and phone calls. You could put your phone in airplane mode with only wifi enabled and be ok, but make sure not to shut airplane mode off until you return home.
Note: you can’t send or receive texts (SMS) from a Wi-Fi connection. Other Apps may allow text-like communications between App users, but they are not as broad as SMS.
So it sounds like if I have easy roam enabled, even if I have access to wifi, I will charged the per diem rate
Yes, unless you and your correspondents use an App such as WhatsApp, or Google Hangouts, etc.