Would an unlocked blackberry 9850 work with a Tmobile sim card?

Would an unlocked blackberry 9850 work with a tmobile sim card? And everything be fine like the picture messaging and web?

Yes, but you need to get one that supports the same frequency bands t-Mobile using for 3g, otherwise will work on 2G (EDGE).

9850 bands are:
CDMA EV-DO 800/1900, GSM/GPRS/EDGE 850/900/1800/1900, UMTS HSPA 2100

After unlocking your Blackberry 9850 it can work with GSM carriers because it has a GSM radio (not a “CDMA only” device).

All you need to do is:
1) get unlocked Blackberry 9850 (or unlock it online using a website for unlocking Blackberry devices).
2) after the device is unlocked update the service books on your Blackberry.
3) restart the device after unlocking and also after updating the service books, you can contact t-Mobile and ask them to send you the update for service books.

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