My experience traveling abroad several months each year is that as long as I don't answer a call I never get charged even if it goes to TMobile voicemail service. Charges occur when calling (even voicemail) or answering without WiFi calling enabled. Always assure wifi calling is active when calling voicemail or refreshing visual voice mail downloaded to phone app too. Listen to visual voicemail messages via phone app with airplane mode enabled so no cell connection is possible. To avoid charges from the phone silently switching from wifi to cell service during the call, enable airplane mode first then wifi and then wifi calling, and visually confirm wifi calling is active.I also just verified this info with T-Mobile rep.
Already have an account? Login
Enter your username or e-mail address. We'll send you an e-mail with instructions to reset your password.
Sorry, we're still checking this file's contents to make sure it's safe to download. Please try again in a few minutes.
Sorry, our virus scanner detected that this file isn't safe to download.