Toufic M.
I had a problem with a number not…
I had a problem with a number not working on WhatsApp. The support team was great and resolved the issue

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
Excellent

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Computers & Phones · Boston, Massachusetts
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Computers & Phones · Cambridge, Massachusetts
Excellent
84 approved reviews, newest moderated first
Toufic M.
I had a problem with a number not working on WhatsApp. The support team was great and resolved the issue
Veronica S.
The services was recommended to me by a friend. The service I used was not allowing text messages to come through and I needed to find one that is just as though I have a local mobile. The setup was super easy. I had to turn over a number from a different provider and even though small problem arise in transfering the number, the rep I worked with, Dee, was amazing in getting it all straightened out. I purchased a yearly subscription and it was less than the service I was using.
CJ
Works great for me. I was able to keep my landline number that I’ve had for years. Customer Service was great (thanks Dee). The number was ported from my landline company for me and all my questions answered to help me get set. Price is very reasonable.
Greg K.
I'm a solo entrepreneur managing various online businesses that gets /makes phone calls, so I'm familiar with second phone number apps. My main issue with many was their cost, which led me to try SLYNUMBER. It offers all the features of my previous second phone number apps, including texting, but at a fraction of the price. I always recommend business owners to obtain a second phone number to separate it from their personal one, and now, I recommend SLYNUMBER as an option. For the price that it goes for, you really get all of the features you will need to run your business.
Bethany
Good product. I see the reviews below but it works for me! I use it to text my students so I can keep my private number private. I recommend.
Milena C.
I'm not sure why others had such a bad experiences with Slynumber mine was completely opposite. I initially got Burner and it was fine but their numbers are VoIP and I needed a number for a business that will be connected to all of my business accounts..long story short, Burner didn't work. I got Slynumber after that and everything synced right away. I think their pricing is fair for the quality of the service. I would recommend it to anyone looking for a business number.
Stephen S.
SLYNUMBER claims that their phone numbers are real Mobile Numbers, DON'T BE FOOOLED their phone numbers are straight up VIRTUAL NUMBERS, SLYNUMBER has the following message right on their website. "Google Voice, Burner, Hushed, Sideline, Phoner, Ding Tone, and Text Free offer VoIP numbers that come with numerous limitations and are currently rejected by many online services and apps. SLYNUMBER is the only mobile app on the market to offer REAL MOBILE NUMBERS No SIM card is required. Just call them LYNUMBER because their phone numbers are VIRTUAL NUMBERS, I purchased a 3 month package and I tried using the number with Cash App & WhatsApp and both times the LYNUMBER was rejected and denied, I received a message from both Cash App & WhatsApp saying they do not accept virtual numbers. And when I emailed LYNUMBER 3 hours after making the purchase well within the first 24 hours of the purchase (which is what their refund policy states must be done in order to receive a refund) they tried telling me that my refund request was not within the 24 hour window that is stated on their refund policy after I knocked that excuse down, they decided to question my truthfulness, Rather then refunding my card as I asked them to do, They offered me the opportunity to change and replace the number I originally chose when I established the account. I decided to give LYNUMBER a chance to redeem themselves, Now remind yourselves they knew the first number did not work with Cash App or WhatsApp, So you'd think that they would make sure the number they were switching me to would work no questions asked on apps like Cash App or WhatsApp...... The new number they gave me, DID NOT TEXT AT ALL.. THE NUMBER DID NOT WORK PERIOD. SOO, DON'T WASTE YOUR TIME WITH LYNUMBER THESE GUYS ARE CROOKED & MISLEADING. You won't be happy,
Scotty W.
Is not an actual cell number (despite their claim). It is a VOIP number and not accepted by PayPal and some other financial sites to send security verification codes to. I had another issue where I could not reset or change my voicemail greeting. Its been 2 days after I asked for a refund. Crickets. Service is trash, dont waste your money! Apple and google app store should remove it.
Response from SLYNUMBERJun 26, 2025
Our number are mobile numbers. The user is incorrect. Any one can verify this by checking this link. https://www.npanxxsource.com/wireless-block-lookup.htm We have thousands of customers that use our service on a daily basis. Financial sites reserve the right to accept or reject the applicant. It has nothing to do with our numbers.