[XPERIA X10 Q&A, Help & Troubleshooting] Che Kirila:
Don't be so quick. Take a look what's going on in T-Mobile US:

Customer Chat

Chat Transcript

Please wait while we find an agent to assist you...

You have been connected to Agent.

Agent: Hi *** , welcome to T-Mobile live Chat. I’m *** and I will be happy to assist you. Please give me a moment to review your question.

Me: Nice to meet you!

Agent: You too and thank you for waiting.

Agent: I understand that you have a Sony Ericsson Xperia and it is asking for an unlock code.

Me: Yes.

Agent: We can definitely look into this for you today because I know that you are wanting to use your phone properly and the services because I know that I would be excited to use my new phone.

Agent: Where did you receive the phone?

Me: I've got it from eBay.

Agent: Okay and do you know what company the phone does come from?

Me: It is T-Mobile UK locked.

Agent: Okay, so the phone was shipped from T-mobile UK?

Me: It was shipped from eBay seller from Great Britain.

Agent: Oh okay and the T-mobile UK would have to unlock the phone for you being that it is from another country.

Agent: I can provide you with the information to get in contact with them to have the phone unlocked.

Agent: The person that you received the phone from on E-bay that lives in Great Britain, would need to contact the carrier and have the phone unlocked.

Me: I've already contacted their customer service, but the seller didn't answer me anymore, so I can not get the code by official for TMO UK way.

Agent: Have you tried to contact the person that you received the phone from?

Me: Yes, of course. Otherwise I wouldn't contact customer service. He stoped answering me.

Agent: Unfortunately, you would have to try and contact him or the carrier at http://www.t-mobile.co.uk being that we would not be able to unlock the phone being that the phone is from T-mobile UK.

Agent: If those options do not work, then you would be able to search the web for third party unlock providers to have the phone unlocked.

Me: But as I know, every carrier has direct connection with cell manufacturer. This is regular way if the code is not in their codebase.

Agent: I can provide you with the customer service number for T-mobile UK, but unfortunately we do not have access to any information from T-mobile in UK.

Me: As I said (typed) I contacted them already and they detailed explained the procedure. This information is provided for carriers by manufacturer. So no need to contact TMO UK.

Agent: We do not have a way to unlock the specific phone that you have.

Me: So you don't want customers to have opportunity to use more expensive plans or make them to pay some third party services to have this service from you?

Agent: We want to provide the best service possible to our customers; however, we cannot provide the unlock code for that particular phone being that it is from T-mobile UK.

Me: Look like shadowy third party services are more powerful, than T-Mobile US.

Agent: We do regret that you feel that way, but at this time we cannot provide unlock codes for other carriers devices.

Me: TMO UK charges their customers for around $24, but you prefer that those money would be earned by someone else. I'd prefer to pay you, than some unknown tech guys.

Agent: I can definitely understand that you don't want to pay a third party provider, however at this time we would not be able to unlock the phone.

Me: At least now I don't have any doubts for contacting this black market.

Agent: I see that you are typing and I am still here.

Agent: We do apologize that we were unable to fully resolve your issue with unlocking your phone for you today.

Me: Any references? I got one from brick-and-mortar T-Mobile shop here, but those guys were unable to unlock this model as well.

Agent: We don't have any listings of third party unlock providers, but you would be able to search the web to see if there are any local ones that are known to unlock phones.

Me: Ok, thanks for information.

Agent: You're very welcome.

Agent: We have determined that we are not able to unlock your phone for you today.

Agent: Is there anything else we can assist you with today?

Me: Are you planning to have this flagship in your stores? As I remember, last 5 years you have never had any Sony Ericsson flagship.

Agent: We don't have any information if we have any new Sony Ericsson's at this time.

Me: OK. Thanks for your time. Have a nice day.

Agent: You're very welcome and you too.

Agent: Thank you for contacting T-Mobile Chat, have a great day!

Agent: Goodbye ***.

Me: Buy!

It was just some minutes ago. The link is

http://support.t-mobile.com/caseSubmitForm.html

TMO UK requires anybody who has TMO-UK-account at least 90 days without any problems and street address since they'll send the code by regular snail mail for 15 GBP.

There is a strong bureaucracy in TMO or they have share in unlocker's profit. By the way, if you want to use 3G from TMO US, you need an european phone, since the frequency for TMO 3G is different, than ATT uses and similar for EU carriers, but TMO US never has any SE flagships in their stores. Britain or Europe Empire strikes back? Or, maybe more likely, ****s back since no power anymore? So you should hate people, who creates rules that encourage developing underground businesses or even criminal ones. Demand creates supply and any restrictions move the market to black side.