If you can get phone call, but no data connection, it is more likely that you forgot to configure the APN settings in Android. Thoses settings aren't built-in the SIM card.
Follow this link, it should fix your problem. http://apn-settings.com/t-mobile-apn...configuration/
Simply put, I believe that you can flash z1c firmware.
This will render some features like tv tuner redundant, but this should be the least of your concerns, assuming that ofutside of Japan it won't work anyway.
If you do not require root, then flashing is straight forward. You should download the latest flashtool and flash an unbranded Rom of your choice. Just choose a region of Rom that has the same band of LTE as yours.
My guess is that this should be enough to make your phone work. My educated guess is that the antenna within these 2 variants are identical. Even though I did not try the LTE, I had a DoCoMo Rom briefly on my z1 compact, and it worked fine, with reception and all.
|lte, so-02f, t-mobile, xperia z1 compact|
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