www.quickim.com

[techsupport]

please check out this page:
http://www.j2mepolish.org/devices/devices-vendor.html

select your device, and look for the lines:
Heap-Size
Maximum Jar Size

The minimum requirement for Maximum Jar Size is 100 kb (or dynamic), this is a strict requirement. For Heap-Size the requirement depends on phones and the approximate value is 500 kb (or dynamic) for non multimedia version and 1000 kb or (dynamic) for multimedia edition.