Back up any data you want to keep
Sign out of accounts and remove SIM and SD cards
Factory reset the phone
Remove any device locks and unlink it from your accounts
Erase data if the phone supports secure wipe options
Donate it if it still works
Trade it in through the manufacturer or carrier
Sell it through a reputable marketplace
Recycle it at an electronics recycling center
Use a retailer take-back program
Check local e-waste disposal rules
Do not throw it in regular trash
Keep the battery intact unless a recycler instructs otherwise