Hotspot and tethering are allowed on the ETravelSim Vietnam eSIM's fixed-data plans, but not on the Unlimited plans, which are designed for single-device use. If you need to share data with a laptop or another phone — common for digital nomads working from Da Nang or Hoi An cafés — pick a fixed plan in the 10 GB, 20 GB, or 100 GB range. Tethered data draws from your plan allowance like any other usage.