Both providers offer "Tourist Packs" designed for short-term visitors. Prices are roughly:
• Vodafone Tourist Pack: ~2,300–2,500 ALL ($24–$26) for 40GB to 100GB of data, valid for 15–21 days.
• One Tourist Pack: ~2,300 ALL ($24) for 40GB of data, valid for 15 days.
• Note: You can often find smaller 10GB–15GB packages for around 1,500 ALL ($16) if you don't need that much data.