October 17th, 2013, 01:16 PM
Join Date: Jul 2011
Location: Rochester, NY
Device(s): Nexus 5, Asus TF700, Google Glass, LTE Nexus 7(2013), Logitech Revue, Chromecast
Carrier: T-Mobile USA
Thanked 4,929 Times in 2,870 Posts
Though I've never done it, isn't the traditional way to unlock the SIM to insert the new SIM that you want to use and it should then bring up a prompt to unlock. Maybe one of those more familiar with GSM phones can confirm or fix my assumption.
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Current Devices: Nexus 5, Asus TF700, Google Glass, (2013) LTE Nexus 7, Logitech Revue, Chromecast
Retired: Samsung Fascinate, Droid Charge, Galaxy Nexus, (2012) WiFi Nexus 7, Nexus 4