SLYNUMBER is a second phone number app from MobileSphere LLC. Its core selling point is that it provides βreal U.S. mobile numbersβ rather than the more common VoIP/virtual numbers. Users can get a U.S. area-code number via the iOS or Android app for calls, SMS, MMS, receiving OTP/2FA codes, and can also add eSIM global data service.
In terms of channels, SLYNUMBER covers SMS and voice. Inbound calls and texts are unlimited, while outbound calls are billed using credits; email or IM capabilities are not shown. For coverage, it mainly provides U.S. mobile numbers and supports choosing from all U.S. area codes. The official site says the app can be downloaded in more than 150 countries and used worldwide over WiFi or mobile data. On performance, the website emphasizes that real mobile numbers are more likely to be accepted by financial services, social platforms, e-commerce sites, and dating apps than VoIP numbers such as Google Voice or Burner, but it does not disclose delivery rates, latency, or an SLA. Integration is primarily through the mobile app. The terms mention API scenarios, but no developer documentation is provided. On compliance, the terms prohibit fraud, illegal use, abuse, and botnet activity, and require users to comply with applicable laws.
Private number costs $49.99/year or $14.99/3 months, including a U.S. mobile number, 100 outbound credits per month, and unlimited inbound calls and texts. Global data costs $5/year and includes 50MB per month plus pay-as-you-go data. Outbound credits can be purchased as one-time top-ups of $10/$25/$50. 1 credit equals 1 minute of calling or 1 SMS/MMS, with international rates varying by destination.
The main advantage is that its numbers are closer to real mobile service numbers, making it suitable for receiving verification codes, financial notifications, privacy separation, online shopping, social/dating apps, and lightweight cross-border communication. It also supports number porting, voicemail, caller ID, spam blocking, and eSIM. Downsides include number resources being concentrated in the U.S., outbound usage requiring credits, limited details on international rates, and a lack of published service performance metrics. The terms suggest it is more oriented toward personal, non-commercial use, so it is not suitable for bulk business SMS or marketing.
The scraped text does not specify accessibility from mainland China, App Store/Google Play availability by region, or payment methods, so access from China is rated as unknown. If you plan to use it in mainland China for stable receipt of overseas verification codes, you should test network connectivity, payment, and compatibility with your target platforms yourself. Alternatives to compare include Google Voice, Hushed, and TextNow.
β This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on slynumber.com official site.
slynumber.com is an United States Comms & Email provider. TG4G tracks its product information, with monthly pricing from $5.00, an overall rating of 7.0/10, and a China-accessibility score of Workable. Click "Visit Official Site" to reach slynumber.com directly.