How Many SMS does android allow?

[revaaron]

I have a HTC TP2, had a regular TP and mogul, all running wimmo 5,6.0-6.5
My biggest problem is that I send SMS a lot. like 1000+ a month.
when I have 1000 SMS on my phone, it becomes almost unusable.
when I have 2000 SMS the phone is mostly dead.
when I loaded 24K from myphone, the phone never recovered.

So how many SMS can you have in android and how does it affect the phone performance?