Where is area code 191?

In the UK, area code +44 191 (or 0191 within the UK) is Tyneside, Durham, and Sunderland.

In North America (USA, Canada, etc.), area codes never begin with 1.

(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.)