Via serial number Sometimes smartphone companies include the manufacturing date in the device's serial number, usually found in the 'About Phone' section. Every number on these devices represents a date, month, or other information that can be used to determine the manufacturing date.
Via Google Dashboard
Click on the Android card under Your Google services section. You will find the activation date of your Android mobile or tablet right below the device name. If you want to customize this name, check out my guide on changing the device name of Android.
Go to settings > Battery and device care > Diagnostics. You can now tap on battery status to check its health status.
As mentioned above, the average lifespan of a cell phone is approximately 2-3 years. However, manufacturers tend to focus on ensuring users enjoy excellent performance during the whole period. So, even though they often provide longer battery life, it doesn't necessarily mean the phone will last longer.
*#*#4636#*#* Displays information about the phone, battery, and various network statistics.
Your original purchase date should be printed on your invoice.
If you want to keep using an iPhone for as many years as possible, avoid buying models that are more than a year old; these models will get cut off from major iOS upgrades sooner than newer devices, which will make them unsafe to use in a much shorter timeframe.
However when it comes to iPhones, you can expect between three to five years (maybe more) with proper care.
Key hardware info: *#0*#
When you enter *#0*# into the phone's dialer, the device enters service mode and brings up a diagnostics menu. From this screen, you can view and run multiple diagnostics to test device hardware like buttons, sensors, and cameras.
What does dialing *#21# actually do? When you dial *#21#, you are, in fact, activating a feature access code that quickly tells you the status of call forwarding for your phone. It's a quick way of seeing what, in the case of this particular 'setting interrogation code,' your call forwarding settings.
2. *#*#7780#*#* (Run a Factory Reset) If you don't want to run a hard reset, this is the next best thing. Similar to a factory reset, this code will simply delete all application data from your device, as well as any applications.
Hide Caller ID: *31#
The caller might have hidden the ID intentionally or sometimes it can be accidental. If you want to hide the caller ID dial *31# and press call button.
##002# - If your voice call or data call, or SMS call has been forwarded, dialling this USSD code will erase them. *#21# - By dialling this USSD code, you would get to know if your calls have been diverted somewhere else or not.
Use the code *2767*3855# to delete all data and reset all settings on your #Samsung phone #MobileTip #MoArmouz | Coding, Phone, Samsung.
Use *67 to hide your phone number
On a per-call basis, you can't beat *67 at hiding your number. This trick works for smartphones and landlines. Open your phone's keypad and dial * - 6 - 7, followed by the number you're trying to call.
As stated above, it's because 9 is one less than our "rollover" number, 10. This actually works in any modulo system where the number you're multiplying is one less than the "rollover" number. For example, in a mod 9 system where we count 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21...
The *#9900# code is a diagnostic mode code for Samsung mobile devices. It can be used to access a variety of system information and diagnostic tools, such as enabling/disabling fast dormancy, logging options, and system dump mode.
“*#62# is the code to check call diverts, otherwise known as call forwarding, while ##002# is the code to check to cancel it,” the message reads.
Android & iPhone code: *#06#
Entering this into your keypad shows your display IMEI number, which is your phone's identification number, and it's unique to each smartphone.
Apple considers any iPhone with a battery capacity of 80% or above to be in optimal condition. In fact, Apple feels so strongly about battery health that its 1-year warranty covers any battery at 80% capacity or more. It's not unusual to see iPhones that, after one year, still have a battery capacity of 95% or above.
There is nothing wrong with it showing 99% after two months. Batteries are consumable, so as you use them, battery health will decline, based on the number of full charge cycles. Apple does not consider a battery problem unless the battery health gets to 80% before the end of one year.