Anyone with cables can jump a car. The question is what happens next. If the battery simply ran down because a door was left ajar, a jump and a long drive solves it. If the battery has lost the ability to hold a charge, or the alternator has stopped charging it, the jump buys you a day and then you're back where you started, probably somewhere less convenient.
Jump start service from a mobile mechanic includes the test. The mechanic jumps the car, then checks battery health, alternator output and the terminals and cables while the engine runs. You find out in five minutes whether you're done or whether the battery needs replacing, and if it does, the mobile mechanic can do it right there.
Mobile-Car-Repair.xyz has a local mechanic in 250 cities. If the car is dead in a driveway or a parking lot, reach out through your city page.