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How to set Belarus in Region Format (for numbers without +375):
install "erica utilities" from Cydia
Open WinSCP and connect to iPhone (same as when you transfer files)
open "Commands" menu and select "Open Terminal"
when Terminal Window appear cut next line:
/usr/bin/plutil -set AppleLocale -value ru_BY /var/mobile/Library/Preferences/.GlobalPreferences.plist
and paste in "Enter_command" then click on "Execute".
if result is OK you can see "Writing new value for AppleLocale to …" without errors .
Use en_BY instead of ru_BY if you prefer english calendar.