Buy a 10 GB eSIM before you fly and decide separately how you will call home. If you call family daily, either add a BOTIM-style licensed app or take the paid tourist SIM with bundled international minutes — old-fashioned but reliable. If a WhatsApp text and the occasional hotel-WiFi video call is enough, the eSIM alone covers you — though whether calls connect on hotel WiFi varies by network.
Skip your home carrier's roaming packs for anything beyond OTP standby — per-day rates in the UAE are usually steep. Keep your home SIM in with data off, exactly as you would elsewhere.
Do collect the free airport SIM even if you have an eSIM — a local number helps with taxi apps, mall WiFi logins, and restaurant bookings, and it costs only a minute at the counter when the offer is running. Sort your first-day plan with the Dubai city tour guide and the Dubai guide.