I took lots of pics with my mobile of family, pets etc when on holiday recently but when I loaded them onto my PC they were very small and when I increased the size the definition decreased making them all blurry. Any suggestions?
I have a Nokia which allows me to change the settings for the photos from decent print up to 28x36 cm (which I usually keep it on) down to small (suitable for MMS). These change the capture resolution and the size of the image file. If you have low resolution to start with then regrettably there is not much that can be done with it. Enhancing will only do so much as basically you cannot improve something that isn't there as anchor stated.
There is one possible solution - print the small pictures after loading them onto the PC, then scan the prints into the PC. During the scanning process, first do a Preview Scan, then on the preview, lasso the whole picture then Scan that. You will then end up with a larger picture!