TODAY 8a: Switch to 5G wireless raises safety concerns. Tips to cope with back to office anxiety. Presidents Day bestsellers.

<p>AT&T is ready to end its 3G service — what you need to know if you still use an older device. Plus, the future of work — Vicky Nguyen is sharing tips on coping with back to office anxiety. And TODAY Bestsellers — Chassie Post is sharing the best items to buy this Presidents Day.</p>