Are cellphones safe? Should you use them? Cellphones are safe. Lots of people have said that cellphones can give you cancer because of all of the radiation in the phone. Scientists have proven this wrong. They have proven this from a series of tests.Though cellphones can't give you cancer they can give you glaucoma (duh duh duh). Glaucoma (duh duh duh) is a very rare brain tumor. It still may be safe.Just don't use it a lot or you will get glaucoma (duh duh duh).They say that kids skulls are thinner so radiation can get in side our heads and give us glaucoma.