Secnum vs String
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Secnum
Get a secondary Israeli mobile number on your existing SIM card for calls and texts. Manage your numbers with features like call forwarding and voicemail transcription. Subscription plans available for SMS and voice minutes.
- Secondary Israeli mobile number
- Make and receive calls
- Send and receive SMS
- Port existing number
- Voicemail transcription
- Call forwarding
- Block list
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Do you want an Israeli mobile phone number on your local SIM card? The secondary number allows you just that without buying another SIM card. The secondary number allows you to make calls from a mobile Israeli phone number in addition to the existing SIM card number on the device, regardless of which operator the subscriber is. The two numbers are on the same mobile phone. You can buy a monthly subscription that includes SMS messages or also voice minutes - both are counted for incoming and outgoing calls. Calls are made through the existing SIM card or using VOIP which uses the existing mobile phone account agreement with the network operator in which it is located. It means it can either use calls or data to make the calls. Service capabilities: • Real Israeli mobile Phone Number • Dial outgoing calls • Receive incoming calls • Send and Receive Text messages • Port your number from another Israeli operator • Multi-language UI support • Block list: prohibited numbers approved number • Option to Block anonymous call • Voicemail transcript for premium subscribers • Incoming calls scheduling module allows divert incoming calls to VM, FW number or DND mode, base on working hours • Group call destitute incoming call/sms among several members The calls are limited only to Israeli numbers. It is restricted to dial premium numbers, abroad or to the Palestinian Authority. Payment is done using Apple store. Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. The account is charged for renewal within 24-hours prior to the end of the current period. Subscription may be managed by the user and auto-renewal may be turned off by going to the user's account settings after purchase. Please review our “Privacy Policy” https://num2-info.sms.hn/Num2/Privacy/il/en and let us know if you have any questions or concerns. Please visit also our “Terms of Use” section establishing the use, disclaimers and limitations of liability ruling the use of this product: https://num2-info.sms.hn/Num2/Terms/en
String
Enhance customer engagement with a business SMS and voice platform. Organize your inbox, automate responses, and manage contacts efficiently. Send personalized messages to individuals or groups, and access your workflow from any device.
- Use existing or new phone numbers
- Organize inbox with sales funnel view
- Automated responses and auto-replies
- Contact management and CRM integrations
- 1-1, group, and mass messaging
- Templates and voicemail transcription
- Browser and mobile app access
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Boost your brand engagement with String’s intuitive business SMS marketing, text and voice. ANY PHONE NUMBER, EVEN LANDLINES Use your existing mobile or landline number with String. Select a new local number or upgrade to a vanity or toll free number of your choice. ORGANIZE YOUR INBOX Transform your inbox into a sales funnel or kanban board with various viewing, filtering and tagging options — Stay on top of your conversations and never miss a message again. POWERFUL MESSAGE MANAGEMENT Mark Unread and Archive — You love it for your emails, you’ll love it for your texts. STAY RESPONSIVE, 24/7 Amplify your interaction with automations and Auto-Replies — Respond to texts and missed calls on time, every time. TAP INTO ENDLESS POSSIBILITIES Contact Management & Integrations — Save important contact notes directly from the message thread. Capture contacts, import from your phone or computer,, automate workflows, integrate with tools you love (like your CRM, etc). REACH THE MASSES, OR JUST ONE Conversational, Groups or Mass Messaging — Respond directly with 1-1 messaging, message with a group,r or send personalized Mass Messages to multiple people at once, individually. BUILD A LOYAL CUSTOMER BASE Send promos, reminders and confirmations and never miss a lead, client or customer with Elite features like triggered Keyword Responses, and Auto-Replies. SAVE TIME Templates — No more copy-pasting the same message over and over. No time to listen to voicemail? View voicemail transcriptions in your inbox with visual voicemail. USE IT ANYWHERE Browser & Mobile Apps — Increase your workflow efficiency with access to String from your computer and mobile device. CALL FORWARDING & VOICE Separate your personal and professional calls with call forwarding and flexible voice settings. GOT QUESTIONS? Email our stellar support at support@joinstring.com. Find helpful articles, join our customer community and create tickets in our Help Center: https://help.joinstring.com/hc/en-us Terms of Service: https://www.joinstring.com/terms Privacy Policy: https://www.joinstring.com/privacy
Screenshots
Verdict
The clearest difference is review sentiment: String at 69% against Secnum's 18%. String also leads on rating (3.5 vs 2.1) and in-app purchases (none vs 17). On price, ads, monetization model 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
Both are free to download. Secnum sells 12 in-app purchases, starting at $2.99 per month. String asks for nothing beyond the download.
String holds the better App Store score, 3.5 against 2.1. That said, the two scores are not equally well evidenced: String has 62 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 18% of Secnum's written reviews are positive against 69% of String's.
Secnum ships an update every 4 months, String every 2 months. The most recent releases landed on September 22, 2026 and July 25, 2026 respectively.
| Parameter | Secnum | String |
|---|---|---|
| Price | Free | Free |
| Rating | 2.1 (9 ratings) | 3.5 (62 ratings) — better |
| Positive reviews | 18.2% of reviews | 68.6% of reviews — better |
| Number of ratings | 9 | 62 — better |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 17 MB | 68 MB |
| Age rating | 4+ | 4+ |
| Developer | Cellact | NumberBarn, LLC |
Customer experience
Secnum
String
In-app purchases
Secnum
- Landline Monthly 500 MIN$2.991 Month
- Monthly 500 SMS only$3.991 Month
- Monthly 120 Plan2 variants$4.991 Month
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- Monthly 120 SMS/MIN2 variants$4.991 Month
- Monthly 500 SMS + 500 minutes$5.491 Month
- Monthly Calls & SMS$6.491 Month
- Monthly 1500 SMS/MIN2 variants$6.991 Month
- Monthly Calls & SMS3 variants$8.991 Month
- Monthly 120 MIN/SMS$9.991 Month
- Monthly 1000 SMS/MIN$14.991 Month
- Premium service for 1 month$7.99
- Replace current number$9.99
String
No in-app purchases









