Only use your fingers or stylus, if one comes with the device, like on the Galaxy Note 3 for example. The Sony Xperia Z Ultra allows you to use pencils on the display, however this should not be done with any other device.
2. Know its limits
Avoid letting your touch screen come into contact with other electrical devices. There are many people who think that magnets will damage your phone, when in fact it likely won’t. The only thing that a magnet might do is mess up your built-in magnetic sensor which is used for compass apps.
3. Try not to get shocked
Electrostatic discharges, meaning a sudden surge of electricity between two connected electrical devices, could ultimately cause the touchscreen to malfunction. This might happen when your smartphone is placed near an object isolated to the ground that conducts electricity.
4. Be gentle, use with care!
This may seem obvious, but do not tap your phone with any sharp objects or bang it to make it work if it’s being laggy. Your smartphone isn’t like your old TV set. Also, though you might get over excited while playing Candy Crush, do not apply excessive pressure to the display.
5. Don't let it idle
Ever heard of the term burn-in? This is what sometimes happens when you leave the touchscreen idle for an extended amount of time without deactivating the display. What you’ll see when you switch to something new is an afterimage, ghosting or screen burn-in, all terms apply here. If this is happening to you, check out how to fix a screen burn-in. One of the best ways to prevent this from happening though, is to set the lock screen to turn off after a certain amount of time in the settings of your smartphone or tablet under the lock screen section.
6. It's better to be safe than sorry, wear protection!
Invest in a screen protector, sleeve, padded bag or hard case for your tablet or smartphone. There are many cheap but effective ones that you can find on Amazon, WalMart, eBay etc. If you drop your phone, scratches are the least of your worries, but shattering or cracking can happen even with the most durable of panels.
7. The sun isn't your friend
Avoid exposure to direct sunlight. Leaving your smartphone or tablet with an LCD display out on the patio in mid-summer can really damage the quality.
8. Treat it like a diva
When cleaning your display, use a microfiber cloth, which is ideal for touch screens. You can even use the one that came with your sunglasses. Be careful if using a moist cloth. Simply dampen it slightly or breath on the screen and then wipe it down gently. If you do end up using water, make sure that it is distilled water since normal tap water often carries calcium and other types of minerals, and do not over-rub. Let your phone air dry if there is any water left over so that you don’t accidentally push any liquid into the phone’s inner hardware.