It is very simple to check if your iphone is new or refurbised. Follow the next step.

1. Go to setting

1. Click General. 

2. Click About. 

If the model first letter start with M then = New

If the mode first letter start wifh F = refurbished  then its is a refurbised device.

Refurbished are repair device or replacement iphone.

Tips: you can check the physical iphone and check your serial number at apple website.

https://checkcoverage.apple.com/my/en/

Install ORACLE XE

Setup CENTOS 7.5 on cloud and install basic tools.

yum install nano -y

yum install unzip -y

yum install bc -y

yum install wget -y

Oracle XE required SWAP files for setup

First you need to check current swap file.

swapon -s

Next check available space.

df

# Create 2GB swap file

dd if=/dev/zero of=/swapfile bs=1024 count=2048kmkswap /swapfileswapon /swapfile

echo "/swapfile swap swap defaults 0 0" >> /etc/fstab

hown root:root /swapfile chmod 0600 /swapfileset

Next Download 

Oracle XE express

https://www.oracle.com/technetwork/database/database-technologies/express-edition/downloads/index.html

rpm -ivh oracle-xe-11.2.0-1.0.x86_64.rpm

Next run the configuration script#

/etc/init.d/oracle-xe configure

To prevent TNS error during OCI_CONNECT.

sebool -P httpd_can_network_connect 1 

The best stock market simulation web apps to learn and practise reading technical chart.http://chartgame.com . 

Mac show hidden folder

Go to the terminal. Type the following command

 defaults write com.apple.finder AppleShowAllFiles YES

Then press Option/Alt key and right click on the finder and cick relaunch to see all hidden folder.

to disable.

 defaults write com.apple.finder AppleShowAllFiles NO

sudo npm install --unsafe-perm --verbose -g sails

Javascript error..Invariant Violation: View config not found for name RNGADBannerView
This error is located at:    in RNGADBannerView (at RNAdMobBanner.js:51)    in AdMobBanner (at App.js:33)    in RCTView (at View.js:60)    in View (at App.js:23)    in codetrAdmob (at registerRootComponent.js:35)    in RootErrorBoundary (at registerRootComponent.js:34)    in ExpoRootComponent (at renderApplication.js:33)    in RCTView (at View.js:60)    in View (at AppContainer.js:102)    in RCTView (at View.js:60)    in View (at AppContainer.js:122)    in AppContainer (at renderApplication.js:32)

Your app is now running at URL: exp://192.168.0.112:19000

View your app with live reloading:

  Android device:

    -> Point the Expo app to the QR code above.

       (You'll find the QR scanner on the Projects tab of the app.)

  iOS device:

    -> Press s to email/text the app URL to your phone.

  Emulator:

    -> Press a (Android) or i (iOS) to start an emulator.

Your phone will need to be on the same local network as this computer.

For links to install the Expo app, please visit https://expo.io.

Logs from serving your app will appear here. Press Ctrl+C at any time to stop.

or to run on device type

react-native run-iosreact-native run-ios