![]() ![]() This is by and large false, with some nuances. There are two types of SIM cards, GSM and CDMA. I am pretty positive that if you were to switch to T-Mobile or to AT&T or any GSM carrier if you go outside the USA, you would not be experiencing this problem. I know a lot of people will argue that CDMA and GSM no longer exist and they might be right, but I'm convinced there's some factor about them that still makes them distinguishable and still has an impact on your usage. Now, I've never tested a Zenfone with a CDMA SIM card, but I'm inclined to believe that it will not work. Even though the Zenfone 9 was released after 3G shut down. What's my evidence? The Zenfones, the smartphones that Asus tell you will not work on CDMA networks. One factor that might play a role is that I've always used BYODs.Ī lot of people say that CDMA and GSM no longer exist because of the shut down of 3G and again, I am not an expert on this subject, but my experience has caused me to not believe this. Now, there are people who have CDMA carriers who claim to be able to use both, but that wasn't my experience. I eventually read on Reddit that the problem was with CDMA carriers, where you couldn't do both somebody and I never made the connection before that both U.S. (2020) I then started using an MVNO of AT&T and have never had the problem since. ![]() I was first with Sprint and then I went with US Cellular, with both carriers, I could not use data while I was a phone call. However, Sprint no longer exists and is now merged with T-Mobile. In the USA, the GSM carriers are AT&T and T-Mobile and the CDMA ones are Verizon, U.S. I'm not a tech expert, but I do have some experience with this problem. You will be able to call and use data at the same time (so long as you have cellular coverage). So the bottom line is that the CS rep is correct in saying your phone won't get WiFi calling, but incorrect in the overall conclusion. The same is not true for AT&T - they only provision VoLTE to devices that are explicitly on their whitelist (PDF).However, Verizon's compatibility check for new service requires a IMEI from a US device (e.g. ![]() All recent Xperias get VoLTE (and thus phone) service on Verizon and T-Mobile.Not even the same as VoWiFi, but it is a prerequisite for VoWiFi. VoLTE is not the same as WiFi Calling.That's because they have their own implementation within the Fi app, and don't rely on VoWiFi as provided by the parent network (T-Mobile). You will still get "WiFi calling" on Google Fi.All US carriers offer this for certain phone models, but none of them work with the Sony Xperia. "WiFi Calling" means a few different things, but most commonly "Voice over Wi-Fi" (VoWiFi).Mobile calling and data (whether mobile data or Wi-Fi) can be used at the same time, no problem.There's some misinformation in this thread - let's get it straightened out. ![]()
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