I have a same issue. I travel to Japan al the time and usually don’t have this type of issue. I wonder why it’s not working. Usually shows soft bank or docomo on the left top corner and that’s not showing anymore and 3G or 4G will shows on the right top corner but I see 4 bars but 3G is showing off and on. This never happened to me. Anybody know how to fix? I called Tmobile and trouble shooting but still not working. Any fix for iphones data roaming issues in Japan? I’m seeing the exact thing Sakura described above - seeing 3G shows on and off next to 4 signal bars. Can call/text but no data. All settings are correct and no data roaming block etc on my account.
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