How to delete their datas without passwords & active SIMs from 3 old dumb phones (T-Mobile's Motorola Razr v3?, Sony Ericsson Z710c, & Kinbo)?

2 photos of them being charged after a decade of not using them: https://matrix.zimage.com/_matrix/media/v3/download/ross154.net/PsvIoFuNldvIjxZqEDIGqxAY/IMG_7436.jpg

Thank you for reading and hopefully answering soon. :)
-- 
"Whoever serves me must follow me; and where I am, my servant also will be. My Father will honor the one who serves me." --John 12:26. We must serve Jesus. It had been 20 yrs. since Asia's tsunami on Boxing day after Xmas. :(
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