What area of Glasgow has area code 433?

Due to number portability, it is no longer possible to narrow down a telephone number to a neighborhood within a city based on the first few digits of the local number.

Glasgow is area code 0141, or +44 141 in international format.

(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, and many other countries use different prefixes.)