Store your stuff in the cloud. You don't need to worry about freeing memory for your favorites or new apps.
With the SkyDrive app, you can copy your contacts and photos from your Symbian phone to SkyDrive. You can later access your data using other devices compatible with SkyDrive, such as Lumia phones, or online at http://www.skydrive.com/.
To upload content, you need an internet connection. If you don't have a data plan, the data transmission costs may pile up quickly. For info about possible data costs, contact your network service provider.