Question 1

How do I turn on Wi-Fi on iOS, Android, Windows or macOS?

Accepted Answer

iOS and iPadOS: Settings → Wi-Fi. macOS: System Settings → Wi-Fi. Windows: Settings → Network & internet. Android: Settings → Network & internet → Internet. Turn Wi-Fi on, then tap a network to join.

Question 2

How do I add an eSIM?

Accepted Answer

iPhone or iPad: Settings → Cellular → Add eSIM, then scan the carrier QR code. Android: Settings → Network & internet → SIMs → Download a SIM instead.

Question 3

How do I switch to dark mode?

Accepted Answer

iOS/iPadOS: Settings → Display & Brightness → Appearance. macOS: System Settings → Appearance. Windows: Settings → Personalization → Colors. Android: Settings → Display → Dark theme.

Question 4

How do I take a screenshot?

Accepted Answer

iPhone: Side + Volume Up. iPad: Top + Volume Up. Mac: Cmd + Shift + 3 or 4. Windows: Win + Shift + S. Android: Power + Volume Down.

Question 5

Is osimulator free and does it work offline?

Accepted Answer

Yes. osimulator is completely free and runs entirely in your browser as a single offline file — no account or internet connection required.