Due to long-term use, old phones accumulate a lot of data along with Maya. What matters is how secure the data is after the exchange. So, before replacing your old phone, keep at least four things in mind.

1. Remove the SIM card: It sounds silly, but many people forget. Your connection number is your identity, on old sims many times phone numbers and short messages are stored on it. So first remove the SIM card.

2. Now it's the memory card's turn: not all phones have a microSD card slot. If present, remove it as well as the SIM card. You can find the slot either under the battery cover at the back or on the side.

3. Clear data: In Android, you get the option to clear all data at once from the settings menu. To do this, go to Settings > System > Reset > Factory data reset – and follow the on-screen instructions. Instructions may vary slightly from phone to phone.

On your iPhone, go to Settings > Reset > Erase All Content and Settings. Double-tap Erase iPhone to confirm. After that, if you correctly enter the Apple ID passcode and password, the work will begin.

Follow the instructions above to remove various apps, account and phone settings, installed apps, songs, pictures and other files. So don't forget to save the necessary files elsewhere (backup).

4. If you want to sell: the inside is clean, now clean the outside. You can replace the screen protector or cover if you want. Give the box to the new owner along with the charger, headphones, etc.