Smartphones and computers are essential tools for many people. Essential tools can break beyond repair or be so old that they are risky to use or even can’t be used for what you need to use them for anymore. Suggesting just not buying technology because of Israel would basically require huge numbers of people to just end up having to quit their job one day because of it.
I honestly wish there was a way to separate Israel from the tech industry, but it’s just not possible right now. Do what you can and not buy things from companies you aren’t forced to rely on, such as Starbucks and McDonalds, that support Israel. That still hurts Israel without hurting you.