Its odd that it says No SIM, I'd figure it would at least ask you for an unlock code. Are you sure you have the SIM in the correct way? If you put them in backwards, the phone won't read it.
If your phone then asks for an unlock code, you'll need to SIM unlock it.
Loving Sony hardware & the Android app store, BUT trying to patiently deal with transitioning from stable, "everything always works" Windows Phone to "always needing an XDA fix" Android.
SonyEricsson T68i / SonyEricsson T616 / HTC Tornado/ HTC Touch Cruise / HTC Touch Diamond 2 / Apple iPhone 3G / LG KS20 / SonyEricsson Xperia X1a/ LG Optimus 7 (e900h)/ Sony Xperia SL
HP Touchpad/ HTC Flyer/ MS Surface / Sony Vaio Duo i7