Can anyone unlock Samsung Galaxy S5 phone purchased thru Straight Talk? They are giving me the run around & saying that they can NOT unlock it & will only buy it back for $89.50. I bought it from them for 649.00 over 2 years ago & just purchased the New Galaxy 8 from them for over 700.00 & wanted to give my mom the Galaxy 5 that I no longer use. After numerous attempts & hours on the phone to get them to unlock the phone so my mom can use it at Tmobile, they just hung up on me. Does anyone know how to UNLOCK It? I'm not selling it back to them for 89.....