Is the iphone 4 a good starters phone?

Tomorrow is my sons birthday, he's turning 11 he's been bugging me, he wants a iphone, do you think the iphone 4, will be a starters phone my daughter is 8 and she has the iphone 1st generation, I think he needs a phone

Sure, or give him another year or so.

Not a fan of giving young children smartphones, but I suppose since you already have a child with one & nothing's gone wrong then it shouldn't be a problem in this instance.