About 6 months back I faced exactly the same issue that Bertrand has faced and T-mobile charged me $385 for 3 whatsapp calls made over wifi even though I had bought a $100 international pass that allowed me to make unlimited no. of international calls. I fought this issue tooth and nail with T-mobile customer service and they eventually waived off around 50 bucks. I ended up paying as dealing with Tmobile customer service is a massive pain. However, after going through multiple forums it is clear that this is a scam being perpetuated by Tmobile. If it is a known issue with whatsapp then it is incumbent on Tmobile to warn their customers before they make wifi calls when traveling internationally. This is a Class Action Lawsuit waiting to happen. I am travelling again this week and have again bought an international pass. If I get charged again this time for a whatsapp call then maybe its time to contact my attorney
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