guides
- Power bank rules on planes: what the FAA and TSA sayThe FAA and TSA say power banks go in carry-on only, capped at 100 Wh each without airline approval. The FAA adds that many airlines set stricter limits, so check yours before you pack.

- How to install a travel eSIM on an iPhoneApple documents several ways to add an eSIM. This guide covers scanning a QR code, tapping a link or app, and typing the details by hand. Wi-Fi and an unlocked phone come first.

- Using a travel eSIM in mainland ChinaAiralo says its eSIMs with China coverage route traffic outside the Great Firewall, so Google and WhatsApp work without a VPN. That is Airalo's claim. Nobody here tested it.

- Can you put an AirTag in checked luggage?The FAA allows luggage trackers in checked bags if they hold 0.3 g of lithium metal or less, and it told the press in 2022 that AirTags meet that. Airlines can still set their own rules.
