The program is really very useful. After switching to a new firmware, I, perhaps, most of all lacked the capabilities of this particular application. Actually, there is nothing special to add to the old description of the program. Here are all known iM clients and plus ip-telephony Skype and SIP.
No problem with Cyrillic. I used to use Skype for calls to other cities, but I was limited in movement by a wi-fi point. Taking into account the unlimited jprs traffic offered by operators, iPhone becomes a mobile ip-phone. I am very pleasantly surprised that the program is free.
The app is available in App Store for free.