The ETravelSim Sri Lanka eSIM is data-only with no Sri Lankan phone number, but ride-hailing apps like PickMe, Uber, and Kangaroo Cabs work fine over data once you sign up with your home phone number. WhatsApp is the default messaging app across Sri Lanka, so most homestays, drivers, and tour operators reach you there. For PickMe verification, your home country number with country code usually works. Keep your home SIM active in your phone for OTPs and calls, with cellular data turned off on that line.