Second phone number to make and receive calls and texts.
SLYNUMBER by MobileSphere offers a real second mobile number for calls and texts with strong privacy features, including spam blocking, do-not-disturb, call forwarding, and an optional eSIM for global connectivity. It shows notable rankings in the COMMUNICATION category across the US and Iran markets and boasts a growing user base, with 100,000+ total downloads and 82K in the last 30 days, along with a 3.84 rating from 1,008 reviews.
Pros & Cons
Real mobile numbers not based on VoIP
Strong privacy protections and minimal data collection
International calling and eSIM support for global connectivity
Spam blocking, do-not-disturb, and flexible call management
No free trial period; pricing is subscription-based with credits for outbound calls/texts
Requires purchasing credits for outbound usage and recurring plans may vary by region
Billing and plans details may require careful review before purchase (3-month and annual options)
About SLYNUMBER
SLYNUMBER is a communication app developed by MobileSphere.
How many times has SLYNUMBER been downloaded?
SLYNUMBER has been downloaded 450 thousand times. In the last 30 days, the app was downloaded 82 thousand times. It is ranked in the top 100 communication apps.
What is the rating of SLYNUMBER?
SLYNUMBER is rated 3.80 out of 5 stars, based on 1.1 thousand ratings.
Is SLYNUMBER free?
SLYNUMBER is free to download. The APK download size is 63.50 MB. The latest version available is 11.3. The last update was on June 19, 2026.
What are the requirements for SLYNUMBER?
SLYNUMBER requires Android 9.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play September 2022.
Description
SLYNUMBER can do everything your primary mobile number can but with added privacy and more features.
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1 star. Does not work after latest update. I just signed up, purchased a full year and was happy that both WhatsApp and Telegram accepted the number for validation (they did NOT treat it as Virtual). However, shortly after, on 23/10, the pushed update broke the app and it no longer opens. Many other users report same. Upd 10/29 Latest Android Beta update fixed the issue without new Sly Number version. Maybe the problem was on Android side. Back to 5 stars as the app, service and price are great
★★★★★Don Joe· Mar 17, 2026
This app makes claims that they do not give out VoIP numbers... which was very interesting to me upon reading... and had me curious about a few things... I rarely find an app that lets you pick a number for free... that doesn't require you to pay right away....that is a very top tier kinda service... if the call quality is good and if messages push through the notification system properly written without delay. I'm pleased to say this app has earned my 5-star rating, until further notice! Very good
★★★★★Miller Josh· Oct 25, 2025
The app is down right now what's happening it's a good app tho it just need to come back on lie asap
★☆☆☆☆Peter Andro· Dec 31, 2025
Not free trial. Impossible to contact because if use contact us option fill question and press send, propose to send email not chat. Probably offers US number only that is useless for my purpose
★☆☆☆☆Subhan Waheed· Dec 5, 2025
Terrible experience. 1) There was an error in processing payment 2) The app doesn't show my number 3) It doesn't allow adding the caller ID 4) It doesn't make calls. It just hangs up 5) It just doesn't work. Still waiting for the response from support team.
★☆☆☆☆R P· May 12, 2026
Bought to open account at Fidelity. USA number (to use outside usa) on sly number fails completely : "We do not support internet based or landline phone numbers". I made the purchase after discussing my needs via Sly number support email. Now lets see how sticky they are to return my 49.99 purchase of a few hous ago. Buyer beware.
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SLYNUMBER is requesting 39 permissions and is using 0 libraries.
Permissions
Development tools
test access to protected storage
Your personal information
read your contacts,
write call log
Services that cost you money
directly call phone numbers
Network communication
view network connections,
view Wi-Fi connections,
pair with Bluetooth devices,
full network access,
make/receive Internet calls,
Google Play billing service,
receive data from Internet
Your accounts
read Google service configuration
Phone calls
read phone status and identity
Hardware controls
take pictures and videos,
change your audio settings,
record audio,
control vibration
System tools
access Bluetooth settings,
allow Wi-Fi Multicast reception,
prevent phone from sleeping
Trust & Safety: The app requests a broad set of permissions typical for a communication app, including network state, notifications, contacts, storage, camera, microphone, Bluetooth, and telephony related permissions, plus ad identifiers and in-app billing. SLYNUMBER states a privacy focus with minimal data collection beyond payment processing and features like spam blocking and do-not-disturb to help users control their communications.
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