I dont agree.
My Sonyericssons was much more reliable then My Nokia Phones.
But as servicer I can say that both have good models and bad models.

In last time i like Sonyericsson K750 becouse I beleive him and have signal on some places where many other mobile phones are unusable. I try with more Nokias but they cant find any network.
And who knows maybe some nokia models has better signal then my K750??