I have a galaxy s6 edge and I am in Mexico. I didn't sign up for extended service with Verizon so I can't text/call. I turned on airplane mode and then turned on my wifi to connect to my free WiFi at my apartment and suddenly am receiving texts. I use the messages app that came with my phone rather than messages+. I used to have an iPhone and I know imessage works over wifi but I can't find anything online to clarify texting abilities through wifi on my galaxy. Is this something I just don't know about? Or I am gonna get some mad charges when I get back to the states?