iPhone 3GS storage is full

I can understand you very well.Because this situation drives people insane indeed. I once have the same trouble.here's some tricks to free up space on your phone.

1. Go to Settings > Safari > Clear History & Clear Cookies & Data. This takes up a surprising amount of space if it isn't cleared on occasion.

2. Go to Settings > General > Usage > Here, you'll see a list of apps that are using your space sorted from the app taking the most space down to the app taking up the least space. Right from here you can remove apps that are killing your storage.

3. I would recommend backing up photos and videos to your computer regularly than deleting them from your phone. Plus you can limit music to what you actually listen to regularly.

4. You can also try some softwares .iMyfone Space Saver for iOS is efficient. iMyfone Space Saver for iOS can free up iPhone space and speed up your device by two steps. This software can deeply scan your iPhone can find the junk files which need to be deleted. Also it make lossless photo compression to save your space. You don’t even have to worry about your photos will be ruined because the compression is lossless and your original photos will be backed up automatically to your computer!