It is... using FAR and one either JDFlasher or SEPF (Maybe XS++ too, I'm not sure, rarely use the FSX feature)
QUOTE
b)You can expand your SMS Memory:
1. Browse to the folder /ifs/settings/messaging/ with FAR Manager
2. select pref_store.txt and copy it to your pc
3. Open pref_store.txt and change "/smsdata" in "/tpa"
4. Save the changes and upload the new file
5. go back to "root" shutdown the loader
EDIT: It doesn't remove the limit, but increases the capacity to thousands, effectively it does remove the limit, but the time it would take for you to open an Inbox with a 1000 SMSes is a different story all together