SD Card and Sony Xperia E3 I recently purchased a 16gb SanDisk SDHC card by mistake (the website said it was a normal SD card, not SDHC.) I put the card in and it seems to be working fine, but I was curious if there could be any damage to the phone or to the data I save to it if the phone isn't compatible? The phone description says it takes up to a 16gb SD card, but doesn't support SDHC cards... and I can't find 16gb versions of the SD card.
NO,It will not harm your phone

Since, operating speed of SD is less than SDHC.Data transfer will occur at same rate which is supported by your mobile phone.
So it will not harm your phone.