The India Independence Act leaves the princes…

The India Independence Act leaves the princes theoretically free to accede to either dominion.

The frontier princely states of Dir, Chitral, Amb, and Hunza accede quickly to Pakistan while retaining substantial autonomy in internal administration and customary law.

The state of Bahawalpur, with a Muslim ruler and a Muslim population, also accedes to Pakistan, as does Khairpur.
(add loc: "Hunza")