By model number, you can find out from which country the iPhone was brought.
The letters after the numbers to the “/” mark indicate the region of sale and warranty service.
For example, MC131TA / A - iPhone 3G 16Gb Black, purchased in Taiwan (Chunghwa Telecom)
The official Russian phone (PCT) numbers are:
MB489RS / A, MB496RS / A, MB500RS / A, MC131RS / A, MC132RS / A, MC133RS / A, MC134RS / A
Guaranteed
unlocked there will be iPhones from such countries: OAU (AE), Czech Republic (CZ), Indonesia (FN, ID, PA, SA), Greece (GR, GB), India (HN), Italy (IP, T), Malaysia (MY) , Russia (RS, RU, RP, QB), South Africa (SO), Ukraine (SU), Taiwan (TA), Thailand (TH), Singapore (ZA), Hong Kong (ZP)
Guaranteed
locked up there will be iPhones from such countries: Japan (J, JP), Lithuania (LT), Philippines (PP), Jamaica (ZQ).
To check the model and country of origin, you can also use special services:
http://iphonefrom.comhttp://appstudio.org/models/