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However, on some phones, there is a feature that lets you capture photos with shutter key even when the screen is still locked (e.g., Sony Xperia S, etc). That’s why, although you may not use it very often, always do a quick test on this shutter key by pressing it over and over again just to make sure that this button still works perfectly. 8. Ensure that the Cellular and Wi-Fi Connectivity Still Work Great Connectivity is the other important element on smartphone. Without this sector, your used phone will be pretty much useless for you. You cannot surf the web, download stuff or connect the apps to internet. Therefore, always run the test of this connectivity feature by browsing the web with the pre-installed browser or any other apps that require 3G/4G and Wi-Fi connectivity on that used smartphone. 9. Check the Bluetooth, NFC or Any Other Off-line Connectivity These connectivity features can be really important in the future because you like it or not, you will need Bluetooth and will use it very often to share contents like photos/music/videos/files with the other devices, while NFC is also really important for the future’s mobile payment.

Therefore, never forget to always run the quick test on Bluetooth, NFC or other several offline connectivity features on the phone. 10. Test the Sound Quality of the Speaker Making a phone call is the reason why cell phone is invented in the first place. Without it, your phone shouldn’t be called as a phone.

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That’s why, if this feature doesn’t work properly, then your used phone will be useless in the future. So it’s also really important to always run the test of this feature by making a random call on other devices and hear if there is something wrong with its sound quality, signal or its loudspeaker. 11. Try to Send Text Message Usually, if the cellular connectivity still works great, then there is a huge chance that you can also send text messages with that phone.

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However, don’t get carried away and sending one text message wouldn’t hurt, right? This is for your own good. 12. Check the Sound Quality of the Phone, With and Without a Headset Most of phone users usually don’t open wide the loudspeaker when listening to music or watching videos. They usually use a headset for most of activities that have sounds in it, like games, movies, music or anything.

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However, in order to make sure that everything is fine, just spend some seconds or minutes to check if the loudspeaker still sounds great or not. 13. Make Sure that the Charging Port Can Still Charge the Phone Charging port is also the other most important thing on smartphone. If the charging port doesn’t work and cannot charge the device properly, this can be really dangerous for you in the future. These days, most smartphones’ charging ports are not just assembled with glue, but on some smartphones, this part is integrated deeply with solder.

So be sure to always check the charging port of the device by plugging in/out the phone with the charger and see if there is slightly delay response on battery bar on the screen when being charged. Your phone is pretty much useless if it cannot be charged. 14. Check the microSD card slot (if there is any) to see if it still works Despite the increasing popularity of huge internal storage smartphones, most phone users still think that microSD card slot as a really vital element on smartphones.

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