But that software cannot unlock P910's anyway - here's what i dug up on the website...
THIS SOFTWARE WILL REMOTE UNLOCK ALL NOKIA
MOBILE PHONES
Just type the IMEI number phone type and network code it will then give you the unlock code to type into the phone.
Not only that but no more guessing which code to use as this software will advice you the best code to use and will also guide you through the process with helpful buttons to guide you along.
MODELS THIS SOFTWARE REMOTE UNLOCK INCLUDE
ALL NOKIA PHONES FROM DCT3 UPWARDS
Including ASIC 6/7 6230 7610 6620 6820 etc
ALL DCT3 Nokia
LOCK 1 & LOCK 2 Codes Provided
Also Support Unlocking For
Samsung Mobiles
LG Mobiles W510 / W520 / G510 / B1200 / M1200 / 7010 / 7020 / 1300 / B1300
Siemens cl50/st55
Panasonic gd50/55
AEG
Vitel
Maxon
Alcatel
Includes
SmartDCT3InfoReaderV1
SmartSagemToolv1
There is no mention of SonyEricsson phones at all.
EDIT:
More info and somebody who will do it for you
here
Albeit its for the P900 but the P910 is the same as is my phone the T630 - its a SonyEricsson thing im afraid - you need a special cable to do it (which that place will supply as well)