SELECT prefixes FROM table_10408617_5 WHERE scheme = "Pence per minute, fixed at all times" AND approx_premium = "3p/min"
Awalan apa yang dihargai di pence per menit, ditetapkan setiap saat dengan premi 3p/menit?
CREATE TABLE table_10408617_5 (prefixes VARCHAR, scheme VARCHAR, approx_premium VARCHAR)