# GSM+ Second Phone Number vs LinOTP Authenticator

The clearest difference is in-app purchases: LinOTP Authenticator at none against GSM+ Second Phone Number's 21. LinOTP Authenticator also leads on iOS requirement (13.0 vs 15.0). GSM+ Second Phone Number's advantage is update cadence (every 3 weeks vs every 8 months). On price, ads and device support 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. LinOTP Authenticator asks for nothing beyond the download.

GSM+ Second Phone Number ships an update every 3 weeks, LinOTP Authenticator every 8 months. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | GSM+ Second Phone Number | LinOTP Authenticator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (758 ratings)](https://appshunter.io/ios/app/gsm-plus-second-phone-number/id1486650699/reviews)** | — |
| Number of ratings | **758** | — |
| Positive reviews | 37.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 8 months |
| Monetization | Free with in-app purchases | — |
| Size | 111 MB | 24 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mobile Victory](https://appshunter.io/developer/1486650698) | [KeyIdentity GmbH](https://appshunter.io/developer/571941070) |

## 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


### LinOTP Authenticator

[App page](https://appshunter.io/ios/app/linotp-authenticator/id6450118468)

**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 LinOTP Authenticator free?

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

### Do GSM+ Second Phone Number or LinOTP Authenticator have ads?

Neither GSM+ Second Phone Number nor LinOTP Authenticator shows ads.

### Which is updated more often, GSM+ Second Phone Number or LinOTP Authenticator?

GSM+ Second Phone Number ships an update every 3 weeks, and LinOTP Authenticator every 8 months. Most recently, GSM+ Second Phone Number was updated on October 29, 2026 and LinOTP Authenticator on October 27, 2026.

---

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