Since Buddhism denies the existence of a separate self, as explicated in the teachings of anatman and sunyata, self-realization is a contradictio in terminis for Buddhism.
If you are calling from other country than Thailand to the Bangkok area, dial IDD of your country, then international phone number (country code) +66, after that phone area code of Bangkok 2 and call number. +66 - 2 (Telephone number).
The full name of Bangkok. 'Bangkok' is just for foreigners, as in Thai it's called something else entirely. Unless talking to foreigners who don't know any different, Thais will never call their capital city Bangkok - indeed, some Thais in the more remote provinces may never have even heard of it being called that.