Good afternoon. I'm from Russia, I write through a translator, so I apologize in advance for not being literate. Given use MIUI from this site, never had problems, but with the release of 2.8.17 and 2.8.24 now had such a problem. Apparatus google nexus s, tested and with full wipe, and just with the update. Call the number +7911xxxxxxx not possible, the robot says "number does not exist." And in 8911xxxxxxxx everything works. All other codes, which is what the +7921, +7905, +7906, work in any combination. I understand that the problem is very specific, but apart from my room +7911xxxxxxxx of nowhere, and this problem in a very small number of users. On the Russian forum solutions I found, maybe you can help me. Thank you.