Samsung Galaxy J2 Prime Dual SIM User Manual page 48

Applications
► Dual SIM models: Tap
Add the number to the contacts
Using speed dial
Set speed dial numbers to quickly make calls.
To set a number to speed dial, tap → Speed dial, select a speed dial number, and then
select a contact.
To make a call, tap and hold a speed dial number on the keypad. For speed dial numbers 10
and up, tap the first digit(s) of the number, and then tap and hold the last digit.
For example, if you set the number 123 as a speed dial number, tap 1, tap 2, and then tap and
hold 3.
or to make a voice call, or tap
list.
48
to make a video call.
Access additional options.
Preview the phone number.
Delete a preceding character.
Hide the keypad.