i think most of the Nokia handphone having low memory problem when using GMXT.
So far, i didnt use A-GPS setting and still manage to lock within 2 minutes commonly.
not only nokia but i think all phones. but with pda you have alternative to play around with settings. i using hp rw6828 (WM5) with gmxt + holux gpslim 236 BT GPSr. Total memory is 53MB for storage (ROM) and 52 MB for application (RAM). Initially also have low memory problem with pda hanging. Using BT GPSr + gmxt + phone + others, the memory for application goes to only 5% free. after reading forum here and also other gps forums, i found the following:
1. use the map lite version. if installing from mapsource don't install the polygons and topo maps. install only the mapset you want. Since I am not going to east malaysia or to thailand, i omit the east malaysia + thailand mapset.
2. use an memory or system optimizer to tweak your phone/pda settings. i use memmaid. my settings are:
Cache size = 16384 KB
Reading Buffer = 122880 KB
File System Cache = Auto
Font cache Size = 8192 KB
Disable window animation
Disable menu animation
Set all TEMP files to write to Storage Card
Set application to use main memory
Set to re-claim RAM and clean every 24 hours
Completely shutdown all un-necesary programs (Windows habit is even though you click on the "X" it doesn't shutdown the application, it is still running in the background)(When i did this, I re-claim almost 50% of the RAM).
Under applications, look for cprog.exe and then terminate it. This is the application for the phone. What happens is everytime you make a phone call on a pda, a new window opens and the windows does not close completely when you end the call. not sure why.
After doing all the above, I found that the system is more responsive and doesn't hang even when running gmxt. There are actually a few more settings but the above are the main ones.
Hope the above is of some help to everyone. I am not sure if it is applicable to nokia or other phones.