No there isn't...Not sure how much you need but I notice that my phone stores more than what my bb storm 2 did. Currently I have 72 on my ip4 and my bb would cap at about 50 or so. Maybe check in your settings?
the IM history is short as well as the recent call list
Does anyone know why or how to increase, this is very annoying I cant look back at a phone call I made a week ago, with the blackberry you could look back 2 months for a call I made or received.