I haven't tracked the cellphone network status continuously, but here in Buenos Aires, I had a VoIP call from 8:30 to 9:00 which worked fine. Until it didn't, at about 9:00, but that's par for the course with fucking Movistar. I was using cellphone data because the power was out in the house. I didn't realize it was out in the entire country.

Here in Argentina, municipal water is totally reliable (I've never heard of a water service loss due to a power outage), but the pressure in the pipes is so low that every individual house has a pump to raise the water into a rooftop tank. These pumps are invariably electric and powered from either the grid or, on the frequent occasions that doesn't work, a generator. Municipal water typically has service losses a few times a year, but not due to blackouts.

Gas stoves are far more common in Argentina than electric stoves, although my apartment has an electric stove, which has a short which electrifies the stainless-steel surface of the stove when it's turned on. Most people in and near the capital run their gas stoves and on-demand hot-water heaters from public-utility natural gas, supplied by local monopolies (state-owned in some cases). Propane cylinders are common in less-populated areas and in houses where the gas piping has been disconnected from the public utility, usually due to billing disputes or safety concerns.

Over the last few years, the utilities have been sandbagging gas reconnections after disconnections due to safety concerns, often allowing them to leave unprofitable customers disconnected for years at a time once someone has called in a gas leak, while they wait for the government price controls (which have fallen far behind our absurd levels of inflation) to be loosened, making those customers' business profitable again. This has been a significant reason for new installations of electrical cooking and hot-water-heating appliances. A court recently ruled against this practice, and so gas reconnections have been sped up lately.

Uruguay has much less use of natural gas, for regulatory reasons: gas appliances can only be installed indoors if the room in which they are installed has a window to the outside that cannot be closed, thus removing the risk of explosions in the case of a gas leak. Consequently in Uruguay gas stoves are almost unheard of, and nearly all cooking is electric. Many hot-water heaters in Uruguay are still the gas-powered tankless type that is nearly universal in Argentina, though. They're just installed outdoors.

(Actually, I'm not sure if the above information about Uruguay applies outside of Montevideo.)

I hope this information is interesting to you!