You'll need to setup w a phone. Any shop can setup the sim card for you on their phone and then insert to your ipad. SIM cards cost about $2 so don't let them rip you off too much

Simpati is the name but it's always a funny laugh when ios autocorrect makes it simpatico (which in spanish means "all good")

Simpati is the most expensive while other companies have unlimited plans for much cheaper. XL was the best last time i was in Bali.