prik is free and with no ads.
[Features of prik]
(1) Dial screen automatically adds prefix you define in the settings screen to the phone number you tapped.
When the user are about to dial without prefix even in the country you set for each prefix, the dial screen will change its background color and propose the user to switch to the prefixed mode.
(2) Outbound calls are recorded on recent calls screen as long as called via this app. You can delete any log one by one.
When you tap a recent call, the dial screen will open. Then you can call the number by tapping call button (handset icon).
(3) Batch processing function adds prefixed number to every phone number of every contact in your iPhone Contacts app.
If a contact has + prefixed phone number, + will be converted into actual international call prefix you set in the settings screen.
These prefixed numbers are just *added* to existing numbers. The existing numbers will never be overwritten.
With this feature, your iPhones recent calls can show the name of persons you call even with prefix.
All the numbers added by this feature can be cleaned up anytime you like only by a single tap.
(4) Create/edit/delete contact groups and add/delete contacts as members of each group you create.
Many contact management apps have this feature for money while this app is free and with no ads.
(5) Customize two prefixes for outbound calling and two prefixes that you want to recognize as the prefix for inhouse extension numbers.
So this app can be used with many IP telephony environment.
If you use phone charge discount prefix services, you dont have to tap the prefix any more with this app.
[Security and privacy]
For the security reasons, prik iteself has no features of calling or sending emails. When you call from prik, prik just opens iPhones phone app.
*) Part of icons of this app are providede by Icons8 https://icons8.com/