I used this www.unlock-sony.com with success. had the code after about 3 days, no need of using usb cables or to download funny programs.
the only thing was they send me 4 codes; CCK - NCK - NSCK & SPCK
but they forgot to tell me which of the 4 codes to use to unlock the x10i. but i found that answer (NCK code) on the forum.xda-developers.com site.
after inserting the non supported network SIM card and typing in the NCK code and all was fine. a well spend £28
Hello from Cyprus.
I am Chris and whatever i say about your service, it will not express my real feelings and the appreciation i have for you guys. I tried FOUR(4) different services to unlock my Vivaz but my unlocking was done only when i found this website on a google search and i was not sure if they are real. I was confident enough to try it because of the paypal payment.
I received the codes in less than 3 days time with very easy step by step instructions.
Even a company that offers great service in unlocking could not unlock my phone and their excuses were very idiot and they also didn't refund me.
I want to say a great THANK YOU and that i will also use you the next time i need unlocking service.
Many thanks, great service, coded delivered in 2 days as stated and worked first time with easy to understand instructions, having tried other companies that failed to deliver I would recommend you anyone.
How to unlock Sony Ericsson Z300i
All we need is the IMEI number of your Sony Ericsson Z300i phone and the network Provider it's currently locked to (we mean the Original Carrier who sold the phone: they have programmed the simlock restriction).
We will use these details to generate your unique and individual unlock code and give your handset total freedom!
You will be emailed your unlocking code along with easy to follow instructions to remove your current network provider simlock with absolutely no risk of damaging your Z300i phone.
Sony Ericsson Z300i Unlocking
We have already provided thousands of Sony Ericsson unlock codes here at Unlock Network, since 2007. We enable you to use your phone on ANY network carrier, local or worldwide.
We are the best in the business. That’s not just talk: Just read through authentic certified Reviews from our customers and you will see we provide excellent customer support and deliver upon it time and time again.
We provide even better service than your official carrier for unlocking your Sony Ericsson device. Why ? Not only we are simply way cheaper and much faster but we also provide you with a complete set of codes you need plus assistance.
Get your Unique Z300i Unlock Code Now!
Fast Delivery, Lowest Price Promise, Simple Instructions and Money Back Guarantee
You will get manufacturer-issued unlock code(s) directly sourced from Sony Ericsson.
You will be provided with step-by-step instructions on how to enter your unlock code on your Sony Ericsson Z300i handset.
Then you simply type the code into your phone and there you are: Z300i Unlocked and ready to accept any GSM provider SIM-card!
Benefits of unlocking your Sony Ericsson Z300i Phone
- Use your Sony Ericsson Z300i with any GSM service provider worldwide, accepting any SIM card.
- Save money on roaming charges when you travel abroad (use local SIM card).
- Will not void factory your Sony Ericsson phone warranty (Official Carriers use exactly the same method)
- Increase the resale value of your unlocked Sony Ericsson Z300i.
- No need to send your phone away, or to waste time to local store: Quickly remote unlocking by code, from Your home!
- No technical knowledge required: If you can dial a telephone number, you can unlock your Sony Ericsson Z300i with a code.
- Change your network provider and keep your phone! No need to buy a new handset.
- Permanent Unlock: Once it's unlocked your phone will stay this way forever.