GleeSim

GleeSim pioneered managing eSIMs through WhatsApp, letting you load data and manage your plan without opening a separate app. The free 3-day 500MB trial for Turkey gets you online quickly with no payment upfront.

This stands out for users who live in WhatsApp anyway and want friction-free data purchases. The WhatsApp-first approach means you're never locked into another platform, though it works best if you already have WhatsApp open constantly.