Comparison

OpusTel vs GSM+ Second Phone Number

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

Head to head
About

OpusTel

This app provides a real Swiss international telephone number for secure VoIP calls on iOS devices. It offers HD audio quality, free global calls between users, and call recording capabilities, all with a focus on user privacy.

Highlights
  • Real Swiss international telephone number
  • Secure VoIP calls
  • HD high-definition audio quality
  • Free global calls between users
  • Call recording
  • Conference calls
  • Automatic language selection
Read full description

OpusTel OpusTel is the mobile phone App for iPhone, iPod and iPad, permitting one to use a real Swiss international telephone number, e.g. 0041 41 520 60 00. It allows one to make and to receive secure VoIP calls from any iOS device using 5G/4G/3G/UMTS or Wi-Fi Internet connectivity. It was developed with the focus on privacy. Features: 1. Secure incoming and outgoing calls 2. Incomming calls are free of charge (no roamingcosts) 2. HD high-definition audio quality with the G722 and Opus codec 3. Free global calls from OpusTel to OpusTel 4. Easy transfer calls to any telephone number 5. Ability to record incoming and outgoing calls 6. Conference calls 7. Automatic language selection based on handy language (15 languages like EN, DE, CN, FR, ES, IT ...)

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

Screenshots

OpusTel4 screens
GSM+ Second Phone Number4 screens

Verdict

The call

The clearest difference is review sentiment: OpusTel at 80% against GSM+ Second Phone Number's 37%. OpusTel also leads on in-app purchases (none vs 10) and rating (5.0 vs 4.6). GSM+ Second Phone Number's advantage is update cadence (every 3 weeks vs every 14 months) and ratings volume (762 vs 7). On price, ads and iOS requirement 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 10 in-app purchases, starting at $9.99 per month. OpusTel asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

OpusTel holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: GSM+ Second Phone Number has 762 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 80% of OpusTel's written reviews are positive against 37% of GSM+ Second Phone Number's.

UpkeepUpdate frequency

OpusTel ships an update every 14 months, GSM+ Second Phone Number every 3 weeks. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.

Scorecard7 real differences · 3 level
OpusTel versus GSM+ Second Phone Number: the parameters behind the verdict, then further details
ParameterOpusTelGSM+ Second Phone Number
PriceFreeFree
Rating5.0 (7 ratings) — better4.6 (762 ratings)
Positive reviews80.0% of reviews — better37.3% of reviews
Number of ratings7762 — better
Update frequencyEvery 14 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS16.015.0 — better
Further details — not scored
Size98 MB111 MB
Age rating4+4+
DeveloperOpusTelMobile Victory

Customer experience

OpusTel

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews10 reviews
Positive80.0%
Neutral10.0%
Negative10.0%

GSM+ Second Phone Number

All ratings757 ratings
Positive89.8%
Neutral2.8%
Negative7.4%
Written reviews75 reviews
Positive37.3%
Neutral2.7%
Negative60.0%

Bugs and requests

OpusTel

Not enough reviews yet to summarise bugs or 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

In-app purchases

None

OpusTel

No in-app purchases

10 purchases

GSM+ Second Phone Number

Subscriptions6
  • Canada - Dual Functionality$9.991 Month
  • US - (Call+SMS)$9.991 Month
  • GB - (Call+SMS)$9.991 Month
Show 3 more
  • US- Dual Functionality$14.991 Month
  • UK - Dual Functionality$14.991 Month
  • Auto Credit Tariff #5$19.991 Month
One-time4
  • Phone number purchase$3.99
  • Phone number purchase$9.99
  • Phone number purchase$19.99
Show 1 more
  • Phone number purchase$39.99

Questions

Is OpusTel free?
OpusTel is free to download, with no in-app purchases.
Is GSM+ Second Phone Number free?
GSM+ Second Phone Number is free to download, with in-app purchases available.
Which has better reviews, OpusTel or GSM+ Second Phone Number?
OpusTel is rated higher. OpusTel averages 5.0 out of 5 from 7 ratings, while GSM+ Second Phone Number averages 4.6 from 762 ratings.
Do OpusTel or GSM+ Second Phone Number have ads?
Neither OpusTel nor GSM+ Second Phone Number shows ads.
Which is updated more often, OpusTel or GSM+ Second Phone Number?
OpusTel ships an update every 14 months, and GSM+ Second Phone Number every 3 weeks. Most recently, OpusTel was updated on November 1, 2026 and GSM+ Second Phone Number on November 7, 2026.

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