Hi,
It's always worth googling your memory card make and model and finding the compatibility lists for it. Most online sellers have a list (taking a look at the M2 you mention and it lists Sony Ericsson compatibility at the bottom of this page) Cards can be a bit tempremental when it comes to compatibility - if you know someone else with a BlackBerry might be worth asking them to test for you first.
If it's not compatible with the BlackBerry you're getting then a couple of solutions are:
USB cable to PC transfer
- linking up your Sony Ericsson to your PC with the USB cable
- Going to My Computer
- You should then be able to see your phone populate in 'Devices with removable storage' - have a look through the folders and you should be able to find your memory card content on there - create a folder on your desktop and copy all of the material from it so you've got it in a save place
- When you've bought a new memory card compatible with the device you're moving to do likewise - plug the BlackBerry in and then copy and paste the folder onto the memory
Memory card USB reader
another option would be to use a memory card reader stick - you can plug your memory card into the USB stick, plug the USB stick into your PC and read, manage and remove your media from there.
When it comes to copy and paste on a BlackBerry I don't use it myself but there are a couple of articles about how to do it on the internet (here's an example)
When you decide what BlackBerry you're having here is a list of SD memory cards on Google (just put your model into the search bar and it'll narrow things down for you
