The most commonly seized items are wallets, cash and smartphones (when the cops seize your smartphone, you have to keep up payments on your plan, but you don’t get to use it anymore).
This is only true if you have a service contract, which most poor people I’ve known don’t. If your phone is month-to-month, you can just stop paying, and they turn off your service. There is no penalty, except maybe a reconnect charge.
You can even continue to use your service. Buy a cheapass smart phone - mine was about $60 - and have the service transferred. Presto, cops can’t call Aunt Sue on your dime any more.
