Will the Argentina eSIM work if I cross into Brazil, Chile, or Uruguay?

No — the ETravelSim Argentina eSIM is Argentina-only, so data stops the moment you cross into Brazil (Iguaçu, Florianópolis), Chile (Torres del Paine, Santiago), or Uruguay (Colonia del Sacramento, Montevideo). For multi-country South America trips, ETravelSim sells separate country eSIMs you can install on the same phone — keep both QR codes, switch the default data line at the border, and your home SIM stays in place throughout. If you're crossing several borders in one trip, a regional eSIM bundle from any provider may work out cheaper than three single-country plans.