Mobile Payments Library for Android

The PayPal Mobile Payments Library lets you accept PayPal payments within your mobile app. A buyer stays in your app while logging in to PayPal, reviewing a purchase, and completing a payment. The library provides the buyer's shipping, billing, and payment information to your app.

Please click here  for library and source code .

Get SIM card number

 TelephonyManager teleManager = (TelephonyManager)getSystemService(TELEPHONY_SERVICE);
 String simNo = teleManager .getSimSerialNumber();

You also need to provide android.permission.READ_PHONE_STATE permission in android manifest file.