To copy all contacts from SIM 1 to SIM 2 in Samsung J2

Copying contacts from SIM1 to SIM2 is easy process in Samsung J2. This procedure is applicable to all android phones apart form Samsung J2.
  1. As a safety measure, we have to backup the contacts first.
  2. Open Contacts → More → Settings
  3. Select Export Contacts
  4. Now Select all (available in the top of all contacts) and tap on Export
  5. Select device storage as storage location
  6. Now all your contacts will be stored in a file name Contacts.vcf
  7. Now you can use import contacts → From device storage → to SIM 2 to import all the contacts from SIM 1 to SIM 2