1
My new phone is similar than yours.
My new phone is similar to yours.
Use similar to when two things are alike but not exactly the same: ‘Your bag is similar to mine.’
2
My brother and I have very similars tastes.
My brother and I have very similar tastes.
Similar is an adjective. Do not add -s when the noun is plural: ‘similar tastes’, ‘similar ideas’.
See SAME