Comparison

GSM+ Second Phone Number vs LinOTP Authenticator

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

GSM+ Second Phone Number

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
Read full description

Cheap Calls for Business and Personal Use Anywhere, Anytime LOOKING FOR A SEPARATE NUMBER FOR PRIVATE COMMUNICATIONS? GSM+ gives you access to multiple phone lines in 40+ countries for business and personal use, all without needing an extra SIM card. Choose a custom number to make calls, send SMS and MMS, and protect the privacy of your real number. Forget the hassle of buying and swapping SIM cards for different numbers. With GSM+, switching between numbers for calls is quick and effortless! Maintain your international number for as long as you desire, and replenish your GSM+ balance with more minutes and SMS. Enjoy making international calls and texts from a different number at the most affordable rates. Calls worldwide are easy and economical with our in-app currency system. GSM+ is perfect for various scenarios, providing additional numbers to use instead of your real phone number: • Online Marketplaces: Safely post ads and communicate using a temporary number. • Dating: Share an alternative number from GSM+ for new connections, ensuring your privacy. • Business Communications: Use GSM+ as a secondary work number to separate professional and personal calls. • Property Rentals and Car Hiring: Remain anonymous and secure by providing a GSM+ number for public services. • Registrations: Sign up for platforms requiring a phone number, including messengers and social networks, without revealing your personal number. Share your actual phone number only with trusted contacts. For all other purposes, GSM+ is your go-to solution! If you wish, you can keep the application away from curious eyes with a PIN code. Other features of the application; - Number blocking. - Ability to disable incoming calls. - Ability to create Voicemail. - Call forwarding. - Ability to turn on/off recordings. - Ability to stop receiving SMS. - Automatic reply to SMS messages. - Ability to turn on/off notifications. - Credit calculation page. - Transaction history page. - SmsActivate alternative. -------------------- About subscriptions: After starting the subscription, the credit amount of the package you selected will be automatically added into your account during each renewal period. Unused credits will not be carried over to the next subscription term. Subscription period is (one) 1 month. In every period, your subscription renews for the amount of the package you selected. Payment will be charged to your iTunes account during confirmation of purchase. Subscriptions automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period, and the cost of the renewal will be identified as well. Subscriptions may be managed by the user and auto-renewal may be turned off in the user's Account Settings after purchase. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Privacy Policy: https://gsmplus.app/docs/privacy.php , Terms Of Use: https://gsmplus.app/docs/tos.php

About

LinOTP Authenticator

Features
Read full description

Use LinOTP Authenticator to secure your accounts with two-step authentication by generating verification codes to access your accounts. Two-step authentication provides an extra level of security for your accounts because every new verification code generated by LinOTP Authenticator is uniquely valid for a single sign in request only. LinOTP Authenticator is compatible with most of your accounts already as it supports standard TOTP and HOTP security algorithms. However, it works best with LinOTP, the enterprise-level 2FA solution. See https://linotp.de for more information. Features: * Generate verification codes offline * Edit your verification accounts * LinOTP Authenticator works with most providers and accounts * Biometric app lock * Simple QR code setup Permission notice: Camera: LinOTP Authenticator will ask you for the camera permission if you want to add accounts using the QR code scanner functionality.Use LinOTP Authenticator to secure your accounts with two-step authentication

Screenshots

GSM+ Second Phone Number4 screens
LinOTP Authenticator4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
GSM+ Second Phone Number versus LinOTP Authenticator: the parameters behind the verdict, then further details
ParameterGSM+ Second Phone NumberLinOTP Authenticator
PriceFreeFree
Rating4.6 (758 ratings) — better—
Positive reviews37.3% of reviews—
Number of ratings758 — better—
Update frequencyEvery 3 weeks — betterEvery 8 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size111 MB24 MB
Age rating4+4+
DeveloperMobile VictoryKeyIdentity GmbH

Bugs and requests

GSM+ Second Phone Number

Reported bugs

2 issues
  • Credits deducted without service
  • Numbers becoming inactive quickly

Requested features

2 requests
  • Add support for more countries
  • Improve customer support

LinOTP Authenticator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

20 purchases

GSM+ Second Phone Number

Subscriptions14
  • Credits Tariff #1$3.991 Month
  • Credits Tariff #3$7.991 Month
  • Credits Tariff #4$9.991 Month
Show 11 more
  • Canada - Dual Functionality$9.991 Month
  • US - (Call+SMS)$9.991 Month
  • GB - (Call+SMS)$9.991 Month
  • US- Dual Functionality$14.991 Month
  • Canada - Dual Functionality$14.991 Month
  • UK - Dual Functionality$14.991 Month
  • Auto Credit Tariff #5$19.991 Month
  • Puerto Rico-Dual Functionality$24.991 Month
  • Auto Credit Tariff #6$29.991 Month
  • Australia - Dual Functionality$39.991 Month
  • GB - (Call+SMS)$59.991 Year
One-time6
  • Phone number purchase$0.99
  • Phone number purchase$3.99
  • Phone number purchase$9.99
Show 3 more
  • Phone number purchase$19.99
  • Phone number purchase$39.99
  • Phone number purchase$69.99
None

LinOTP Authenticator

No in-app purchases

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.

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