I bought the smartphone (t-mobile) from ebay, and seller told that i can use any sim-cards, but my russian sim-card (MTS provider) doesn't work. What can I do for unlock my smartphone? Please help me.
I'm sorry you're having problems getting your Dell Venue Pro unlocked. We've reached out to the manufacturer regarding this issue and this device was designed to be used in conjunction with a T-Mobile SIM card only. There is no way to unlock the device for use on other carriers. I apologize that you received incorrect information from the seller.
Let me know if there is anything else I can do to help!
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