Comparison

Karrier One vs 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

Karrier One

This app integrates communication tools like calling and texting with digital finance management, including a blockchain wallet and AI assistance for transactions. It offers a unified platform for everyday communication, mobile connectivity, and digital asset management.

Highlights
  • VoIP calls and global texting
  • Purchase and manage phone numbers/plans
  • Integrated Sui blockchain wallet
  • Phone-number-based crypto transactions
  • AI Butler for transaction assistance
  • Unified communication and finance platform
Features
Read full description

Connectivity Without Borders Bring your calls, texts and wallet payments together with Karrier One. Manage mobile connectivity and send or receive supported digital assets through your Sui wallet, all in one app. Karrier One brings communication and digital finance together in one powerful mobile app. With Karrier One, you can make calls, send texts, manage your Sui blockchain wallet, and use AI Butler to simplify transactions. Instead of relying only on long wallet addresses, Karrier One helps make sending and receiving easier by connecting payments to a phone-number-based experience. Whether you are looking for everyday communication or a smarter way to interact with blockchain, Karrier One gives you a single app for mobility, messaging, and digital assets. Key features Call and text with ease Make VoIP calls and send messages to phone numbers worldwide from one simple interface. Buy a phone number Get your own number directly through the app and stay connected for voice and messaging. Activate a phone plan Purchase a mobile plan for cellular mobility and manage your connectivity in one place. Sui wallet built in Store, send, receive, and manage supported digital assets through the integrated wallet experience. Send using a phone number Move funds more easily with a phone-number-based flow instead of dealing only with complex wallet addresses. AI Butler assistance Use AI Butler to help initiate transactions, guide actions, and make the wallet experience more intuitive. Unified experience Karrier One combines communications, mobility, and blockchain utility into one modern app. Why Karrier One Karrier One is designed for users who want more from a mobile app: communication, connectivity, and digital finance working together in a seamless experience. From calling and texting to managing your wallet and activating service, Karrier One puts essential tools in one place. Download Karrier One and experience a new way to connect, transact, and move.

About

Second Phone Number

Get a dedicated second phone number for unlimited, high-quality calls without needing a new SIM card. Ideal for business, personal privacy, or managing multiple projects with crystal-clear VoIP technology.

Highlights
  • Real US/Canada numbers
  • Unlimited calling
  • International calling
  • HD-quality VoIP calls
  • Privacy protection
  • Call recording
  • Voicemail service
Features
Read full description

Keep your real number private. Record every call. Text safely. Secondly gives you a real US or Canada phone number — instantly. Make calls, send texts, and record conversations, all without touching your personal number. Perfect for business, dating apps, marketplace sales, or anyone who values their privacy. WHY SECONDLY? - Real US & Canada Numbers — Get a genuine local number in seconds. No SIM card, no extra phone. - Built-in Call Recording — Save every important conversation. Never lose a detail again. - Text Messaging — Send and receive texts from your second number. Keep your real number private. - HD Voice Quality — Crystal-clear VoIP calls that sound better than your regular line. - Unlimited Calls & Texts — Talk and text without limits across the US and Canada. - International Calling — Reach contacts abroad at affordable rates. - Total Privacy — Your real number stays hidden. Always. ADDITIONAL FEATURES - Voicemail service for missed calls - Anonymous calling option - Block unwanted callers and spam texts - Separate work and personal communication WHAT USERS SAY - "Best second number app I have used. The recording feature alone is worth it." - "Perfect for my Marketplace sales. Buyers can call or text — but never see my real number." - "Crystal clear calls and easy setup. Got my US number in 30 seconds." WHO IS IT FOR? - Business owners — Keep work calls and texts separate. Record client meetings. - Freelancers — Give clients a professional number for calls and texting. Document every call. - Online sellers — Protect your real number on Facebook Marketplace, Craigslist, OfferUp. Reply by text safely. - Daters — Stay safe on Tinder, Bumble, Hinge. Text or call without sharing your real number. - Travellers — Affordable international calls and texting from one app. - Privacy-first users — Use for banks, deliveries, sign-ups, verification codes, customer service. START YOUR FREE TRIAL Try Secondly free for 7 days. Cancel anytime. Get your second number in under a minute. YOUR PRIVACY MATTERS Secondly never shares your personal data. Your real number stays hidden from everyone you call or text through the app. SUBSCRIPTION PLANS Secondly offers flexible subscription plans for premium numbers. Prices vary by plan, starting from $5.99/week to $69.99/year. Your subscription automatically renews unless turned off at least 24 hours before the end of the current period. Manage your subscription in your Apple ID account settings. IMPORTANT - Unlimited calls and texting are subject to fair usage policy. See Terms for details. - For incoming calls and texts, make sure push notifications are enabled. Privacy Policy: https://sites.google.com/view/dualnum/privacy Terms of Use: https://sites.google.com/view/dualnum/terms EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Karrier One4 screens
Second Phone Number4 screens

Verdict

The call

The clearest difference is in-app purchases: Karrier One at none against Second Phone Number's 10. Karrier One also leads on ads (none vs shown) and rating (5.0 vs 4.6). Second Phone Number's advantage is ratings volume (166 vs 1) and iOS requirement (15.0 vs 17.0). On price, review sentiment, update cadence 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. Second Phone Number sells 10 in-app purchases, starting at $1.99 per 7 days. Karrier One asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Karrier One holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Second Phone Number has 166 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 0% and 0% positive.

UpkeepUpdate frequency

Karrier One ships an update every 4 weeks, Second Phone Number monthly. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.

Scorecard6 real differences · 4 level
Karrier One versus Second Phone Number: the parameters behind the verdict, then further details
ParameterKarrier OneSecond Phone Number
PriceFreeFree
Rating5.0 (1 ratings) — better4.6 (166 ratings)
Positive reviews0.0% of reviews0.0% of reviews
Number of ratings1166 — better
Update frequencyEvery 4 weeks — betterMonthly
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.0 — better
Further details — not scored
Size59 MB87 MB
Age rating17+4+
DeveloperKarrier One IncVora Bhavik

Customer experience

Karrier One

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Second Phone Number

All ratings147 ratings
Positive91.8%
Neutral1.4%
Negative6.8%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Karrier One

No in-app purchases

10 purchases

Second Phone Number

Subscriptions6
  • Pro Access – Weekly Pack3 Days trial$1.997 Days
  • Pro Plus Access – Weekly Plan3 Days trial$2.997 Days
  • Pro Access – Monthly Pack3 Days trial$5.991 Month
Show 3 more
  • Pro Plus Access – Monthly Plan3 Days trial$7.991 Month
  • Pro Access – Annual Pack3 Days trial$39.991 Year
  • Pro Plus Access – Yearly Plan3 Days trial$49.991 Year
One-time4
  • Unblock user$4.99
  • Reactivate Account$5.99
  • 100 Credits$9.99
Show 1 more
  • 1000 Credits$39.99

Questions

Is Karrier One free?
Karrier One is free to download, with no in-app purchases.
Is Second Phone Number free?
Second Phone Number is free to download, with in-app purchases available.
Which has better reviews, Karrier One or Second Phone Number?
Karrier One is rated higher. Karrier One averages 5.0 out of 5 from 1 ratings, while Second Phone Number averages 4.6 from 166 ratings.
Do Karrier One or Second Phone Number have ads?
Second Phone Number shows ads; Karrier One does not.
Which is updated more often, Karrier One or Second Phone Number?
Karrier One ships an update every 4 weeks, and Second Phone Number monthly. Most recently, Karrier One was updated on November 4, 2026 and Second Phone Number on November 5, 2026.

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