# SmartLine Second Phone Number vs String

The clearest difference is review sentiment: String at 69% against SmartLine Second Phone Number's 15%. String also leads on monetization model (free with in-app purchases vs subscription). SmartLine Second Phone Number's advantage is rating (4.7 vs 3.5) and ratings volume (44K vs 62). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SmartLine Second Phone Number holds the better App Store score, 4.7 against 3.5. That said, the two scores are not equally well evidenced: SmartLine Second Phone Number has 44K ratings behind it against 62, so its average is the more settled of the two. Written reviews complicate that: 15% of SmartLine Second Phone Number's written reviews are positive against 69% of String's, so the app with the better star average is not the one people write more warmly about.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 10, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | SmartLine Second Phone Number | String |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (44K ratings)](https://appshunter.io/ios/app/smartline-second-phone-number/id1161533637/reviews)** | [3.5 (62 ratings)](https://appshunter.io/ios/app/string-modern-phone-inbox/id1445655431/reviews) |
| Number of ratings | **44K** | 62 |
| Positive reviews | 15.5% of reviews | **68.6% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Subscription | **Free with in-app purchases** |
| Size | 75 MB | 68 MB |
| Requires iOS | **12.1** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [GoDaddy.com, LLC](https://appshunter.io/developer/333201816) | [NumberBarn, LLC](https://appshunter.io/developer/1031383867) |

## What reviewers say

### SmartLine Second Phone Number

[App page](https://appshunter.io/ios/app/smartline-second-phone-number/id1161533637)

Get a dedicated second phone number for your business to maintain privacy and professionalism. This app ensures calls are business-related, offers a spam filter, custom voicemail, and voicemail-to-text transcription. Manage your business communications efficiently with organized history and timely notifications.

**Highlights:** Dedicated business phone number, Professional call quality (not VoIP), Spam call filtering, Customizable voicemail greetings, Voicemail to text transcription, Set business hours for calls, Organized call and text history

**In-app purchases:** none

**What reviewers like**

- 🚀 Convenient business line
- 📝 Stores call/text history
- ⏱️ Ability to set business hours

**What reviewers complain about**

- 🐛 Unreliable text messaging
- 📞 Missed/dropped calls
- 🔔 Delayed/missing notifications
- 🤖 Poor customer support

**Reported bugs**

- Disappearing call/text history
- Incorrect number display on outgoing calls
- Failure to sync across devices

**Requested features**

- Ability to send multiple photos/files
- Improved caller ID display
- Option to have multiple voicemail greetings
- Compatibility with VPNs and older devices


### String

[App page](https://appshunter.io/ios/app/string-modern-phone-inbox/id1445655431)

Enhance customer engagement with a business SMS and voice platform. Organize your inbox, automate responses, and manage contacts efficiently. Send personalized messages to individuals or groups, and access your workflow from any device.

**Highlights:** Use existing or new phone numbers, Organize inbox with sales funnel view, Automated responses and auto-replies, Contact management and CRM integrations, 1-1, group, and mass messaging, Templates and voicemail transcription, Browser and mobile app access

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Organizes texts like email
- 🚀 Efficient for business communication
- 💡 Automates common questions
- 👍 Easy to use interface
- 👍 Great for small businesses

**What reviewers complain about**

- 🐛 Mobile app is buggy
- 🐛 Website loads to white screen
- 🐛 App loads messages out of order
- 🐛 Threads don't load
- 🐛 Incorrect contact loading

**Reported bugs**

- Calls drop within seconds
- Line cuts out completely
- Website loads to a white screen
- App loads message threads out of order
- Tapping into a thread does not load any part of the conversation

**Requested features**

- Improve mobile app stability
- Fix website loading issues
- Ensure message threads load correctly
- Improve contact loading accuracy
- Fix push notification badge issues


## Frequently asked questions

### Is SmartLine Second Phone Number free?

SmartLine Second Phone Number is free to download, with no in-app purchases.

### Is String free?

String is free to download, with no in-app purchases.

### Which has better reviews, SmartLine Second Phone Number or String?

SmartLine Second Phone Number is rated higher. SmartLine Second Phone Number averages 4.7 out of 5 from 44K ratings, while String averages 3.5 from 62 ratings.

### Do SmartLine Second Phone Number or String have ads?

Neither SmartLine Second Phone Number nor String shows ads.

### Which is updated more often, SmartLine Second Phone Number or String?

SmartLine Second Phone Number ships an update every 2 months, and String every 2 months. Most recently, SmartLine Second Phone Number was updated on November 10, 2026 and String on November 2, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*