# Second Phone Number Calling vs Build Clock

The clearest difference is in-app purchases: Build Clock at none against Second Phone Number Calling's 8. Build Clock also leads on update cadence (every 5 days vs every 3 weeks). Second Phone Number Calling's advantage is iOS requirement (15.0 vs 18.6). On price, ads and device support there is nothing between them.

Both are free to download. Second Phone Number Calling sells 8 in-app purchases, starting at $5.99 per 7 days. Build Clock asks for nothing beyond the download.

Second Phone Number Calling ships an update every 3 weeks, Build Clock every 5 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Second Phone Number Calling | Build Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (649 ratings)](https://appshunter.io/ios/app/second-phone-number-calling/id6443417799/reviews)** | — |
| Number of ratings | **649** | — |
| Positive reviews | 94.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | Subscription | — |
| Size | 68 MB | 5 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Second Phone Number & Texting LLC](https://appshunter.io/developer/1645520873) | [Cody Rust](https://appshunter.io/developer/1883598046) |

## What reviewers say

### Second Phone Number Calling

[App page](https://appshunter.io/ios/app/second-phone-number-calling/id6443417799)

This app provides a private, secondary phone number on your existing device, allowing for unlimited calls and texts without an extra SIM. Protect your primary number from spam and manage work-life balance effectively with flexible calling and messaging features.

**Highlights:** Get verified USA phone numbers, Unlimited local and international calls, Send SMS and view message history, Send FAX worldwide, Block undesirable phone numbers, Name Number feature for identification

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pick your phone number | $5.99 | per 7 days |
| 1 Phone Number | $7.99 | per 7 days |
| 1 phone number | $9.99 | per month |
| 1 phone number | $14.99 | per month |
| 3 phone numbers | $27.99 | per month |
| 3 phone numbers | $74.99 | per year |
| 3 phone numbers | $119.99 | per year |
| New Phone Number | $5.99 | one-time |

**What reviewers like**

- 🚀 Efficient and reliable
- 🔒 Keeps personal information private
- 👍 User-friendly and intuitive
- 🚀 Seamless call and text experience
- 💰 Affordable international calls

**What reviewers complain about**

- 🐛 Occasional connectivity issues
- ⚠️ Unreliable customer support
- 💰 Subscription fees may be a concern for some
- 🔍 Limited feature customization options

**Reported bugs**

- Login and account management problems
- Inconsistent call quality in low signal areas
- Billing and subscription issues

**Requested features**

- Improved call blocking and spam filtering
- Integration with popular messaging apps
- Expanded number selection options
- Enhanced voicemail and call forwarding features


### Build Clock

[App page](https://appshunter.io/ios/app/build-clock/id6760277533)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Second Phone Number Calling free?

Second Phone Number Calling is free to download, with in-app purchases available.

### Is Build Clock free?

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

### Do Second Phone Number Calling or Build Clock have ads?

Neither Second Phone Number Calling nor Build Clock shows ads.

### Which is updated more often, Second Phone Number Calling or Build Clock?

Second Phone Number Calling ships an update every 3 weeks, and Build Clock every 5 days. Most recently, Second Phone Number Calling was updated on November 3, 2026 and Build Clock on October 31, 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.*