Calling Card vs Prefix App
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calling Card
This app helps you save money on international calls by managing calling cards and carrier prefixes. It can automatically select the best card for you based on the number you dial. It also supports PBX routing and Skype To Go calls.
- Manage multiple calling card accounts
- Automatic card selection
- Dial from contacts or recent calls
- Support for international prefixes
- Flexible call detail setup
- Display local time for contacts
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The ultimate iPhone calling card/IDD dialing application - save money when calling contacts from your iPhone by using one or more cards or carrier prefixes to get the best rates - even have the application automatically select the best card for you based on the selected number. Save money on all your international calls using the most popular calling card application for the iPhone. The application can also be used to route calls through a PBX system (no actual calling card required) or for Skype To Go calls. Main features: • Set up multiple phone/calling card accounts and easily switch between them - support for multiple access numbers per card. • Automatic card selection based on contact and/or number prefix. • Set up a list of favorite numbers to dial, select any number from your contacts, call a number from the recent calls placed from the application, or directly enter a phone number to be dialed. • Full support for international prefixes (numbers starting with '+'). • Flexible call details setup allows for automatic dialing of most phone cards even if intermediate menu selections have to be made. • Display local time for contact to be called (time zone lookup based on the phone number) - support for all international numbers. • Card definitions can be shared between different devices via simple email export/import. –––––––––––––––––––––– Winner "iPhone Apps Excellence Award for 2008" (iPhonefootprint.com)!
Prefix App
Easily add prefixes to phone numbers without altering your contacts. Ideal for business users, it offers extensive customization for prefixes and your address book. Includes Siri and Apple Watch support for seamless integration.
- Add prefixes without editing contacts
- Multiple customizable prefixes
- Full and customizable address book
- Recent calls list
- Siri support
- Today widget and Apple Watch app
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Prefix App lets you put a prefix (or suffix) before any phone number without editing your address book. Perfect for business phones and special carrier plans. FEATURES • Full address book • Multiple customizable prefixes • Customizable suffix • Favorites • Recent calls • Direct call from the keypad • Today widget • Apple Watch app • SIRI support • Simple, intuitive and smart interface No more editing contacts or retyping numbers by hand!
Screenshots
Verdict
The clearest difference is price: Prefix App at Free against Calling Card's $1.99. Prefix App also leads on rating (5.0 vs 3.2) and update cadence (every 3 weeks vs every 3 months). Calling Card's advantage is in-app purchases (none vs 2) and ads (none vs shown). On ratings volume and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Prefix App is free to download; Calling Card costs $1.99 up front. Prefix App sells 2 one-off in-app purchases. Calling Card asks for nothing beyond the download.
Prefix App holds the better App Store score, 5.0 against 3.2. Both are backed by a comparable volume of ratings — 6 and 3 respectively. Written reviews complicate that: 62% of Calling Card's written reviews are positive against 37% of Prefix App's, so the app with the better star average is not the one people write more warmly about.
Calling Card ships an update every 3 months, Prefix App every 3 weeks. The most recent releases landed on November 6, 2026 and November 4, 2026 respectively.
| Parameter | Calling Card | Prefix App |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 3.2 (6 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 62.4% of reviews — better | 37.3% of reviews |
| Number of ratings | 6 — better | 3 |
| Update frequency | Every 3 months | Every 3 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Requires iOS | 11.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 3 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Andreas Amann | Alain Lima |
Customer experience
Calling Card
Prefix App
Bugs and requests
Calling Card
Reported bugs
13 issues- Duplicate contact creation with dialing codes
- App crashes on iOS 3.1, 4.x, 7.x and later versions
- Cannot input # or * characters in custom numbers
- Hangs when selecting contacts from list
- Ignores pause (,) between numbers
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- Inconsistent dialing speed and timing
- Freezes on last entered phone number
- Doesn't work with certain calling card providers
- Corrupts Google Contacts and removes custom ringtones
- Bypasses calling card and makes direct international calls
- Adds unwanted comma between prefix and number
- First call fails but second call works
- Doesn't work with Rogers, Topup, and other specific cards
Requested features
13 requests- Support for # and * character input
- Voice activation/VoiceOver compatibility
- Direct dialing from contacts app
- Faster DTMF dialing speed
- Favorites-only contact selection
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- Multiple PINs per card
- Bluetooth headset compatibility
- GPS-based access number selection
- Option to not modify contact list
- Shorter pause durations
- Default to home screen after call
- Pause and Wait functionality
- Integration with address book as default dialer
Prefix App
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Calling Card
No in-app purchases
Prefix App
- Call from Apple Watch$0.99
- Remove ads$1.99









