I know very little about how mobiles work (understatement) and wonder if anyone here can help me. My Samsung mobile has an 8Gb SIM card which is now full and this is affecting the performance of the phone. I have 32Gb of SD memory but it is not being used at all; the SIM card does not seem to recognise it. Is it possible to get the SIM card to change its mind and acknowledge the SD memory? The other options would seem to be 1) a new SIM card with more memory (if I do this can I keep my original number?) 2) a new phone.

Any suggestions appreciated.