Guinea-Bissau

#149 of 193 countries

484632247728

That piece first turns up at decimal place 1,450,588,226 of π (about 1.5 billion digits in).

Guinea-Bissau is 12 digits on the keypad. We look up at most 10 digits at a time, so it is ranked by its longest piece we found: the 10 digits 4846322477.