Yes, AeriSIM offers an unlimited data eSIM for Serbia. The plan, named “Balkans 11 Countries eSIM – 1 Day / Unlimited, ” costs $4.04 USD and is valid for 1 day. It is an unlimited plan, but speeds may be throttled after heavy use, with a maximum speed of 5000 kbps, and tethering is allowed. If users are concerned about potential speed restrictions, they should contact AeriSIM to confirm the Fair Usage Policy and typical data available at normal speed.