Go to Settings > Touch ID & Passcode. On devices without Touch ID, go to Settings > Passcode: Tap Turn Passcode On. Enter a six-digit passcode. Or tap Passcode Options to switch to a four-digit numeric code, a custom numeric code, or a custom alphanumeric code. Enter your passcode again to confirm it and activate it.
Wales uses the same currency as the rest of the United Kingdom, the British Pound Sterling.
Anyway there is only one currency in the United Kingdom- the British Pound. Ireland the Republic of course is on the Euro like most of the E U. Wiki about pound Stirling notes. Coins are the same in Northern Ireland and in the rest of UK, so no problems there. Bank of England notes circulate freely in NI. Notes you get from ATMs and in change in NI are mostly local notes printed in NI.