mino G.
Once again
Once again, I try to end out text messages, and some are delivered, and others are not delivered. I have reached out to customer service. Let's see how long it wil take them to just even answer me.

SLYNUMBER is the easiest way to add a second mobile number to your phone - no SIM card or new device is needed.
SLYNUMBER (slynumber.com) has 84 customer reviews on Five Star Index, with an average rating of 3.2 out of 5.
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Computers & Phones · Somerville, Massachusetts
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Showing 36 reviews with 1 star · Clear filters
mino G.
Once again, I try to end out text messages, and some are delivered, and others are not delivered. I have reached out to customer service. Let's see how long it wil take them to just even answer me.
Dan B.
I used their service. Their app keeps logging out (so anyone who tries calling me once I'm logged out can't reach me). I tried to port out my number but they refuse to give me my transfer PIN number. STAY AWAY!
Response from SLYNUMBERDec 9, 2025
Hi Dan. Your PIN was provided to you yesterday. If you have any additional questions, please email [email protected].
LP W.
A criminal enterprise, run by a Bulgarian scammer through a UK dissolved company according to public records. Refuses to port number, which is illegal. Does not respond to support emails. Disabled SMS receiving on the number we paid for.
Response from SLYNUMBERDec 9, 2025
Thank you for sharing your feedback. We are an American company and it looks like your number was ported out successfully! Please email our support team at [email protected] with your account information so we can review the details and provide a clear explanation of what happened. Please reference your review here. We do want to note that all accounts are subject to our Terms of Use. If an account is found to have violated those terms, we’re unfortunately unable to reopen it. However, we’re more than happy to review your case to ensure everything was handled correctly.
New L.
I don't see the need to give this app any stars because it's nothing but a scam and lies. I bought a number at the same time, and I noticed it wasn't connecting. I had to call the number 10 times before it connected. I reported, and no one helped. When I asked for a refund, they closed my account without issuing one. I have emailed them so many times, but no one has responded. I advise that no one should waste money on these people. The authority should look into these people—they need to be processed.
Response from SLYNUMBERDec 9, 2025
Thank you for sharing your feedback. We’re sorry to hear about the situation with your account, and we’d really like the opportunity to look into this further. Please email our support team at [email protected] with your account information so we can review the details and provide a clear explanation of what happened. Please reference your review here. We do want to note that all accounts are subject to our Terms of Use. If an account is found to have violated those terms, we’re unfortunately unable to reopen it. However, we’re more than happy to review your case to ensure everything was handled correctly.
CM S.
I have been using SLYNUMBER for my personal and business communications, and the service has effectively been unusable for over a month. In mid-October the app started logging me out automatically every day, which caused me to miss an emergency call even though my phone and Wi-Fi were working normally. A few days later, all of my messages disappeared and I stopped receiving any new ones. Since then I have repeatedly contacted support, followed every instruction (log out/in, uninstall/reinstall, check notifications, send diagnostic files and screenshots), and sent multiple “ESCALATE” emails as requested. I have attached the same diagnostic file several times and clearly explained that no messages appear in the app even when notifications arrive. Despite this, I keep getting generic replies asking me to explain the issue again, which makes it clear that my previous messages and attachments are not being properly reviewed. As of mid-November, I still have no access to my message history and still cannot reliably receive new messages. Losing a month of communications and having such poor follow-through from support is unacceptable for a service that is supposed to handle phone and text communication. Based on my experience, I cannot rely on SLYNUMBER for anything important.
Response from SLYNUMBERNov 19, 2025
Hello, I would be happy to help you resolve this. Can you please email [email protected] so I can resolve this issue ASAP?
code
I recently purchased a number from SlyNumber. The website and service looked good, so I decided to use it. However, I am not able to send SMS messages right now. The messages are not going through. So I contacted with support team but, they're not reply. I think this is bad service.
Response from SLYNUMBERDec 9, 2025
Thank you for sharing your feedback. We’re sorry to hear about the situation with your account, and we’d really like the opportunity to look into this further. Please email our support team at [email protected] with your account information so we can review the details and provide a clear explanation of what happened. Please reference your review here. We do want to note that all accounts are subject to our Terms of Use. If an account is found to have violated those terms, we’re unfortunately unable to reopen it. However, we’re more than happy to review your case to ensure everything was handled correctly.
The H.
This app is a very shitty app , stay away and beware . Support doesn’t exist . They don’t reply to emails . They are scammers . Beware and they refuse to refund .
Roberto O.
Very bad service. The WiFi calling almost never works and when you contact them via email they don’t answer. Don’t waste your money on this!