Appworthy
App Store
Version 2.4.1 · 2026-10-27
Thanks for your support. This version: - New country numbers supported. - User Experience Optimization.
Second Phone Number - Dou Line
WiFi Call + Text，Just Chat Now
Ningbo Yilian Internet Technology Co., Ltd.App Store rating4.5★25 ratings
PriceFreeIn-app $1.99–$119.99
Age12+Store age rating
Size54 MBiPhone download
CategorySocial
What we found
Full reportToo little checked to say Store information only. We haven’t analysed this app or read its reviews yet.
Money
- Free to download · in-app purchases $1.99–$119.99 (10 listed, the most the App Store shows). Monthly plans $4.99 (about $60 a year) and $19.99 (about $240 a year); yearly plans $29.99 and $119.99. The other purchases’ names don’t say how often they bill.
- If you subscribe through the store, cancel in iPhone Settings → your name → Subscriptions. Deleting the app doesn’t cancel a subscription.
Not yet tested.
The store currently lists version 2.4.1, updated 2026-10-27.
Preview
Store screenshots supplied by the developer.
About this app
Dou Line - Your Ultimate Second Phone Number Solution!
With just a few taps, you can order a new number in Dou Line, and start using it for calling, texting, and receiving calls and texts. You can even manage multiple numbers easily within the app. It's like having an extra phone with multiple SIM cards in your pocket, without the hassle of carrying multiple devices.
Whether you need a second phone number for personal use, such as online dating, travel, shopping, moving, selling stuff, or for business use, such as sales, freelancers, or entrepreneurs, Dou Line provides you with reliable, high-quality calling and texting services at your fingertips. Perfect for anyone who values privacy and flexibility.
Key Features:…
From the developer’s store description.
For developers and the curious
The full report
The evidence, sources, measurements and versions behind every label above.
Findings and evidence
Not yet tested. No analysis has been published for this app. A missing label is not a clean bill of health.
What reviewers report
No review analysis published for this app.
Measurements
“Not assessed” means we could not measure it. It is never a zero and never a pass.
From store data and reviews
Developer replies to reviews
Not assessed
Fewer than 50 reviews scanned — too few to state a rate
Price in the store description
The store description doesn’t list prices (most don’t)
Cancelling, in the store description
The store description says how to cancel
Themes reported by reviewers
Not assessed
This app's reviews have not been assessed yet
Five-star share of ratings
80–89% five-star
Arithmetic on the stores' own published rating counts. It says nothing about why the ratings fall where they do.
In the app package we scanned
No package has been scanned for this app, so nothing is published about what it ships. That is an absence of evidence, not a finding.
Sensitive permissions
Not assessed
No package has been scanned for this app
Analytics or tracking SDKs in the scanned package
Not assessed
No package has been scanned for this app
Advertising SDKs in the scanned package
Not assessed
No package has been scanned for this app
How we know
Supporting measurements: not a complete list of possible harms or positives. Measurement vocabulary 1.4 · how these are measured
Versions and dates analysed
Not yet tested. No analysis has been run for this app, so there is no version or date to report.
Store update history
Each store’s release notes, as the developer wrote them. They are the developer’s words, not ours.
Assessment record
- Status
- Not yet tested
- App identifier
second-phone-number-apple-6476860001- Sources used
- None recorded
- Reviews read
- None recorded
- Package examined
- No package scan
- Human inspection
- Not completed
How we know
- Measurement vocabulary
- 1.4
Store facts
What the stores publish. Store ratings are the stores’ numbers, not Appworthy’s, and are never averaged across stores.
App Store
- Store rating
- 4.48 ★ · 25 ratings
- Version
- 2.4.1
- Updated
- 27 Oct 2026
- Price
- Free · In-app purchases
- Age rating
- 12+
- Size
- 54 MB
- Developer
- Ningbo Yilian Internet Technology Co., Ltd.
- Category
- Social
- Listing price
- Free · In-app purchases
Purchases the store lists
What this app sells
From the store listing. Billing terms are read from each purchase’s name — the stores don’t publish them — so treat them as a strong hint, not a disclosure.
Subscriptions6
Number MonthlyMonthly$4.99
Number 2 MonthlyMonthly$4.99
Number 3 MonthlyMonthly$4.99
Number MonthlyMonthly$19.99
Number YearlyYearly$29.99
Number YearlyYearly$119.99
Show 4 more purchases we couldn’t categorise
These are really on sale; we just can’t tell from the name whether they recur.
Credits of $1.99Term not stated$1.99
Credits of $4.99 + promo bonusTerm not stated$4.99
Credits of $9.99Term not stated$9.99
Credits of $4.99Term not stated$4.99
This list is cut off. Apple shows at most 10 in-app purchases, and this app is at the limit — so it very likely sells more than we can see.
Method and limits
What a missing label means
Not yet tested. No analysis has been published for this app, so there is no method to describe for it yet. A missing label is not a clean bill of health: it means nothing has been read, not that nothing is wrong.
Limits of this report
- A package scan is static. It identifies code and text in one Android build. It does not measure a live ad session, test a deletion request, or count the steps needed to cancel.
- Reviews keep their sample. A review-only charge shows distinct reviewers, the share and the sample size, and is published only once it clears that label’s published threshold. Calibration labels are machine-drafted and not yet confirmed by a person.
- Not assessed is a state. It is never a zero and never a pass.
- A missing label is not a clean bill of health. It means the evidence did not support one, not that the app is problem-free.
Not yet human-reviewed. A human review gives an app hands-on, recorded measurements. None has been run for this app. Hands-on inspections are not yet open.
Request a correction
Write to [email protected], or use the form. Name the finding, the app version and the evidence that needs correcting. Factual corrections are free and never depend on buying anything.