# GSM+ Second Phone Number vs Spark Builder Admin

The clearest difference is in-app purchases: Spark Builder Admin at none against GSM+ Second Phone Number's 21. Spark Builder Admin also leads on update cadence (every 9 days vs every 3 weeks). GSM+ Second Phone Number's advantage is device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. GSM+ Second Phone Number sells 20 in-app purchases, starting at $3.99 per month. Spark Builder Admin asks for nothing beyond the download.

GSM+ Second Phone Number ships an update every 3 weeks, Spark Builder Admin every 9 days. The most recent releases landed on October 17, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | GSM+ Second Phone Number | Spark Builder Admin |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (757 ratings)](https://appshunter.io/ios/app/gsm-plus-second-phone-number/id1486650699/reviews)** | — |
| Number of ratings | **757** | — |
| Positive reviews | 37.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 9 days** |
| Monetization | Free with in-app purchases | — |
| Size | 111 MB | 45 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Mobile Victory](https://appshunter.io/developer/1486650698) | [Gitspark Technologies, LLC](https://appshunter.io/developer/1669355905) |

## What reviewers say

### GSM+ Second Phone Number

[App page](https://appshunter.io/ios/app/gsm-plus-second-phone-number/id1486650699)

Obtain multiple virtual phone numbers from over 40 countries without needing an extra SIM card. Use these numbers for calls, texts, and registrations to protect your personal number's privacy. Enjoy affordable international communication and manage your lines easily.

**Highlights:** Multiple virtual phone numbers, Supports 40+ countries, No extra SIM card needed, Make calls and send SMS/MMS, Call recording, Voicemail creation, Call forwarding

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

**In-app purchases (20)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Credits Tariff #1 | $3.99 | per month |
| Credits Tariff #3 | $7.99 | per month |
| Credits Tariff #4 | $9.99 | per month |
| Canada - Dual Functionality | $9.99 | per month |
| US - (Call+SMS) | $9.99 | per month |
| GB - (Call+SMS) | $9.99 | per month |
| US- Dual Functionality | $14.99 | per month |
| Canada - Dual Functionality | $14.99 | per month |
| UK - Dual Functionality | $14.99 | per month |
| Auto Credit Tariff #5 | $19.99 | per month |
| Puerto Rico-Dual Functionality | $24.99 | per month |
| Auto Credit Tariff #6 | $29.99 | per month |
| Australia - Dual Functionality | $39.99 | per month |
| GB - (Call+SMS) | $59.99 | per year |
| Phone number purchase | $0.99 | one-time |
| Phone number purchase | $3.99 | one-time |
| Phone number purchase | $9.99 | one-time |
| Phone number purchase | $19.99 | one-time |
| Phone number purchase | $39.99 | one-time |
| Phone number purchase | $69.99 | one-time |

**What reviewers like**

- ⭐ Great app
- 👍 Works well
- 🔥 Excellent service

**What reviewers complain about**

- 🐛 App not working
- 💰 Expensive
- ⚠️ Issues with SMS/calls

**Reported bugs**

- Credits deducted without service
- Numbers becoming inactive quickly

**Requested features**

- Add support for more countries
- Improve customer support


### Spark Builder Admin

[App page](https://appshunter.io/ios/app/spark-builder-admin/id6740566824)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is GSM+ Second Phone Number free?

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

### Is Spark Builder Admin free?

Spark Builder Admin is free to download, with no in-app purchases.

### Do GSM+ Second Phone Number or Spark Builder Admin have ads?

Neither GSM+ Second Phone Number nor Spark Builder Admin shows ads.

### Which is updated more often, GSM+ Second Phone Number or Spark Builder Admin?

GSM+ Second Phone Number ships an update every 3 weeks, and Spark Builder Admin every 9 days. Most recently, GSM+ Second Phone Number was updated on October 17, 2026 and Spark Builder Admin on October 13, 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.*