# Beta Chi Lambda vs Duo Phone Number

The clearest difference is in-app purchases: Beta Chi Lambda at none against Duo Phone Number's 12. Beta Chi Lambda also leads on ads (none vs shown). Duo Phone Number's advantage is update cadence (fortnightly vs every 40 months) and iOS requirement (13.0 vs 15.6). On price and device support there is nothing between them.

Both are free to download. Duo Phone Number sells 12 in-app purchases, starting at $0.99 per 7 days. Beta Chi Lambda asks for nothing beyond the download.

Beta Chi Lambda ships an update every 40 months, Duo Phone Number fortnightly. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Beta Chi Lambda | Duo Phone Number |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (385 ratings)](https://appshunter.io/ios/app/duo-phone-number-2nd-line/id1662423907/reviews)** |
| Number of ratings | — | **385** |
| Positive reviews | — | 55.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 40 months | **Fortnightly** |
| Monetization | — | Free with in-app purchases |
| Size | 25 MB | 108 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Ricardo Cumberbatch](https://appshunter.io/developer/1455104172) | [JUSI PTE.LTD.](https://appshunter.io/developer/1659814629) |

## What reviewers say

### Beta Chi Lambda

[App page](https://appshunter.io/ios/app/beta-chi-lambda/id1642503859)

**Features:** macOS Compatibility

**In-app purchases:** none


### Duo Phone Number

[App page](https://appshunter.io/ios/app/duo-phone-number-2nd-line/id1662423907)

This app provides a private second phone number for calls and texts, allowing you to separate personal and work communications. It offers global calling and texting capabilities with various credit plans and an optional premium subscription for an ad-free experience.

**Highlights:** Private second phone number, Global calls and texts, Cost-efficient international rates, HD voice quality, Caller ID enabled, Two-way SMS/MMS, Ad-free premium option

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic Week | $0.99 | per 7 days |
| Premium Week | $1.99 | per 7 days |
| Basic Month | $1.99 | per month |
| DuoPhone 1Number + FreeCredits | $2.99 | per 7 days |
| Premium Week | $3.99 | per 7 days |
| Premium Month | $3.99 | per month |
| DuoPhone 1Number + FreeCredits | $5.99 | per month |
| Premium Month | $7.99 | per month |
| Credit 100 | $1.99 | one-time |
| Credit 500 | $7.99 | one-time |
| Credit 1000 | $9.99 | one-time |
| Credit 5000 | $39.99 | one-time |

**What reviewers like**

- 👍 User-friendly interface
- 💬 Messaging and calling functionality
- 🎁 Free trial availability
- ⭐ Positive user experience for some users

**What reviewers complain about**

- 💰 Expensive pricing and hidden charges
- 🐛 Messages and verification codes not received
- 📵 Non-functional phone numbers
- 🚫 Deceptive billing practices
- 😤 Poor customer service and refund issues

**Reported bugs**

- Verification codes not arriving
- Messages failing to send or receive
- Phone numbers not working or unreachable
- Error 999 when attempting to use numbers
- SMS and call functionality non-operational despite purchasing credits

**Requested features**

- More free credits or coins
- Increased call allowances
- Better notification system for OTP codes
- Removal of excessive ads
- Improved number availability and validity


## Frequently asked questions

### Is Beta Chi Lambda free?

Beta Chi Lambda is free to download, with no in-app purchases.

### Is Duo Phone Number free?

Duo Phone Number is free to download, with in-app purchases available.

### Do Beta Chi Lambda or Duo Phone Number have ads?

Duo Phone Number shows ads; Beta Chi Lambda does not.

### Which is updated more often, Beta Chi Lambda or Duo Phone Number?

Beta Chi Lambda ships an update every 40 months, and Duo Phone Number fortnightly. Most recently, Beta Chi Lambda was updated on October 27, 2026 and Duo Phone Number on October 30, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*