I'm wanting to get a SIM for my iPhone (3rd gen) ideally to pick up at KLIA Terminal 1 (only need data for a 30 days holiday for maps, taxis etc first in KL and the Penang). Used Klook before for South Korea SIM card, but they only had one with celcomdigi but says not available from Terminal 1. As I will be staying at a city center hotel I can get a SIM there instead - would welcome recommendations. Does it make any difference to price if I pre-order or just walk up to any SIM provider at KLIA T1? Thanks