Comparison

SmartLine Second Phone Number vs Quo (formerly OpenPhone)

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

Head to head
About

SmartLine Second Phone Number

Get a dedicated second phone number for your business to maintain privacy and professionalism. This app ensures calls are business-related, offers a spam filter, custom voicemail, and voicemail-to-text transcription. Manage your business communications efficiently with organized history and timely notifications.

Highlights
  • Dedicated business phone number
  • Professional call quality (not VoIP)
  • Spam call filtering
  • Customizable voicemail greetings
  • Voicemail to text transcription
  • Set business hours for calls
  • Organized call and text history
Read full description

SmartLine is a second phone number for your business. When you receive a call through SmartLine, you know it’s for business so you can answer professionally. When you call or text through SmartLine, customers see your new business phone number so your personal number stays private. - Professional Quality. Calls use your cellular connection – NOT VOIP – to give you the call clarity and reliability you need to sound professional. - Spam Call Filter. Answer calls with confidence because spam calls are sent directly to voicemail. - Custom Voicemail. Record a custom voicemail greeting to prompt callers to leave a message. - Voicemail to Text. Get your business voicemail automatically transcribed to text to save you time. - Set Business Hours. Choose when you’re available for business calls and send callers to voicemail after hours. - Stay Organized. See your conversation history of calls, texts, pictures, and voicemail, organized by contact. - Stay Notified. Be notified and follow up quickly whenever you have missed calls, voicemail messages, or texts. -- Terms -- An existing SmartLine subscription is required to use this app. Currently available in the US only. SmartLine will automatically renew via iTunes, unless you cancel 24 hours before the the end of the current billing period. Easily manage and cancel your SmartLine 2nd phone number at any time through your iTunes subscription settings. If you didn't purchase SmartLine through iTunes, you can manage your subscription through the GoDaddy website. Terms of use: https://www.godaddy.com/legal-agreements.aspx Privacy policy: https://www.godaddy.com/Agreements/Privacy.aspx

About

Quo (formerly OpenPhone)

This business communication platform integrates calls, texts, and customer data into a single system. It offers AI-powered call answering, flexible routing, and a mini CRM to enhance customer relationships and streamline operations for growing businesses.

Highlights
  • Integrated calls and texts
  • Mini CRM with customer notes
  • AI-powered 24/7 call answering
  • Shared inboxes for team visibility
  • Flexible call routing
  • Customizable contact properties
Features
Read full description

Never lose a customer with Quo. The only phone system that helps businesses continue to build personal customer relationships at scale. Trusted by more than 90,000 companies — from fast-growing startups to Fortune 500s — and rated #1 in customer satisfaction on G2. Quo brings calls, texts, and customer information together in one platform. Bring clarity to every conversation. Shared inboxes, internal notes, and a mini CRM, gives every teammate the visibility and context they need to make sure each customer doesn't get missed. Respond to every customer. Fast. Built-in AI answers calls 24/7, flexible call flows route customers instantly, and custom contact properties ensure you're there when your customer needs you, while never missing a detail. Scale effortlessly as you grow. From your first customer to your thousandth, Quo adapts with you. No complex setup, no additional training, no growing pains. With Quo, it’s never been easier to close more deals, support more customers, and grow your business — without losing the human touch. Terms of use: https://www.quo.com/terms Privacy policy: https://www.quo.com/privacy

Screenshots

SmartLine Second Phone Number4 screens
Quo (formerly OpenPhone)4 screens

Verdict

The call

The clearest difference is in-app purchases: SmartLine Second Phone Number at none against Quo (formerly OpenPhone)'s 5. SmartLine Second Phone Number also leads on rating (4.7 vs 4.4) and ratings volume (44K vs 11K). Quo (formerly OpenPhone)'s advantage is update cadence (every 9 days vs every 2 months) and review sentiment (34% vs 15%). 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. Quo (formerly OpenPhone) sells 5 in-app purchases, starting at $21.00 per month. SmartLine Second Phone Number asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

SmartLine Second Phone Number holds the better App Store score, 4.7 against 4.4. Both are backed by a comparable volume of ratings — 44K and 11K respectively. Written reviews complicate that: 15% of SmartLine Second Phone Number's written reviews are positive against 34% of Quo (formerly OpenPhone)'s, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

SmartLine Second Phone Number ships an update every 2 months, Quo (formerly OpenPhone) every 9 days. Both last shipped on November 4, 2026.

Scorecard8 real differences · 3 level
SmartLine Second Phone Number versus Quo (formerly OpenPhone): the parameters behind the verdict, then further details
ParameterSmartLine Second Phone NumberQuo (formerly OpenPhone)
PriceFreeFree
Rating4.7 (44K ratings) — better4.4 (11K ratings)
Positive reviews15.5% of reviews33.7% of reviews — better
Number of ratings44K — better11K
Update frequencyEvery 2 monthsEvery 9 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationSubscriptionFree with in-app purchases — better
Best chart rank—#52 — better
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.1 — better16.0
Further details — not scored
Size75 MB139 MB
Age rating4+4+
DeveloperGoDaddy.com, LLCOpenPhone Technologies Inc

Customer experience

SmartLine Second Phone Number

All ratings44,037 ratings
Positive94.0%
Neutral3.3%
Negative2.7%
Written reviews110 reviews
Positive15.5%
Neutral13.6%
Negative70.9%

Quo (formerly OpenPhone)

All ratings10,819 ratings
Positive84.2%
Neutral3.9%
Negative11.9%
Written reviews771 reviews
Positive33.7%
Neutral8.2%
Negative58.1%

User reviews

SmartLine Second Phone Number

From 44K App Store ratings

What we love

  • 🚀 Convenient business line
  • 📝 Stores call/text history
  • ⏱️ Ability to set business hours

Room to improve

  • 🐛 Unreliable text messaging
  • 📞 Missed/dropped calls
  • 🔔 Delayed/missing notifications
  • 🤖 Poor customer support

Quo (formerly OpenPhone)

From 11K App Store ratings

What we love

  • 🚀 Great phone
  • 👍 Fantastic App
  • 👍 Great app!
  • 👍 Great service
  • 👍 Amazing!

Room to improve

  • 🔇 Unable to mute individual numbers
  • 🐛 SMS notifications don't alert sometimes
  • 🔒 Forced to let AI read all of our messages
  • 🔒 Scam
  • 🔒 Complex Registration

Bugs and requests

SmartLine Second Phone Number

Reported bugs

3 issues
  • Disappearing call/text history
  • Incorrect number display on outgoing calls
  • Failure to sync across devices

Requested features

4 requests
  • Ability to send multiple photos/files
  • Improved caller ID display
  • Option to have multiple voicemail greetings
  • Compatibility with VPNs and older devices

Quo (formerly OpenPhone)

Reported bugs

20 issues
  • Messages don't always appear
  • Does Not Work for SMS Verification
  • Bad connection
  • OTP malfunction
  • Issues with calls showing as scam
Show 15 more
  • Muffled sound quality
  • Incorrect notifications
  • Calls not ringing or going to voicemail
  • Texts not sending
  • Dropped calls
  • Syncing issues with contacts
  • Delayed notifications
  • Ringtone issues
  • Billing issues
  • Account blocking
  • Porting issues
  • Inability to delete messages
  • Call quality issues
  • Number showing as spam
  • Inability to search messages by number

Requested features

5 requests
  • Make it Conference Call option
  • Custom Notification Tones
  • Transfer Call & 3 Way
  • Dark mode option
  • Advanced analytics dashboard

In-app purchases

None

SmartLine Second Phone Number

No in-app purchases

5 purchases

Quo (formerly OpenPhone)

Subscriptions5
  • Starter Plan7 Days trial$21.001 Month
  • Starter Plan - 2 Numbers$26.001 Month
  • Starter Plan - 3 Numbers$31.001 Month
Show 2 more
  • Starter Plan - 4 Numbers$51.991 Month
  • Starter Plan - 5 Numbers$64.991 Month

Questions

Is SmartLine Second Phone Number free?
SmartLine Second Phone Number is free to download, with no in-app purchases.
Is Quo (formerly OpenPhone) free?
Quo (formerly OpenPhone) is free to download, with in-app purchases available.
Which has better reviews, SmartLine Second Phone Number or Quo (formerly OpenPhone)?
SmartLine Second Phone Number is rated higher. SmartLine Second Phone Number averages 4.7 out of 5 from 44K ratings, while Quo (formerly OpenPhone) averages 4.4 from 11K ratings.
Do SmartLine Second Phone Number or Quo (formerly OpenPhone) have ads?
Neither SmartLine Second Phone Number nor Quo (formerly OpenPhone) shows ads.
Which is updated more often, SmartLine Second Phone Number or Quo (formerly OpenPhone)?
SmartLine Second Phone Number ships an update every 2 months, and Quo (formerly OpenPhone) every 9 days. Most recently, SmartLine Second Phone Number was updated on November 4, 2026 and Quo (formerly OpenPhone) on November 4, 2026.

Other comparisons