I got an old Android phone (HTC MyTouch) from someone in the States. The phone says "T-Mobile" on the top.
I put in my O2 SIM chip (Germany), turned it on, typed in the SIM, but then it asks me to type in a "SIM network unlock pin".
I went to T-Mobile here in Germany and they said to "contact T-Mobile in America" who may be able to unlock it for me.
I went to the O2 shop in Germany and they said it would definitely not be possible to use this Android phone with my O2 SIM chip.
Before I sink hours into contacting T-Mobile in the States, can someone tell me from experience if it is (technically and legally) possible to use this Android phone in Germany?