Alexis V.
Problem was solve immediately
Problem was solve immediately I just send an email and in matter of seconds everything solve and very friendly. Shout to Dee, Amazing service

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.
Is this your business?
Correct your details and reply to customers in public. Both are free.
Claim this listing
Computers & Phones · Somerville, Massachusetts
Excellent

Computers & Phones · Natick, Massachusetts
Excellent

Computers & Phones · Boston, Massachusetts
Excellent

Computers & Phones · Cambridge, Massachusetts
Excellent
84 approved reviews, newest moderated first
Alexis V.
Problem was solve immediately I just send an email and in matter of seconds everything solve and very friendly. Shout to Dee, Amazing service
Yi
Nice services.
Dawn
Customer service is very responsive and resolved my issue so fast. That really means something! This company really cares about their customers and they really want to make their product the best for their customers.
Mino G.
The app is down since last night - can't sign in and I can't sign in even on my computer to see what's going on. I have messaged customer service 5 hours ago and still no answer. Clearly, they don't have a 24-hr customer service so if their service is down, you don't have a phone service until they report back to work! This is not the first time it happened!
Jeff S.
SO MUCH REGRET Several years after signing up for this service, they are now refusing to port out the number, coming up with arbitrary excuses. I have duplicate charges, with documentation that they refuse to rectify, support just doesn't even reply. Basically a scam/fraudulent company that should be shut down. They're overbilling, refusing port outs... I thought we got control of these scam telecom companies. FCC asleep at the wheel. They have no phone number listed on their website, terms of service, clearly they are used to ducking and avoiding accountability. Look hard for a way to contact them before you sign up, they only have an email inbox they they ignore. SUPER SHADY ORGANIZATION HERE
Response from SLYNUMBERJul 11, 2025
I am not sure who this customer is since they did not leave any information. We are not a shady organization. We allow people to port out their number. It is in our terms of service: https://slynumber.com/terms.html The user whoever you are please reply with the email you have sent our support that justifies your review.
Latin B.
Lets give you another chance to see if you guys fix your contact page on yiur website.
Response from SLYNUMBERJun 24, 2025
10 minutes after the customer sent us the email we have replied to the customer to confirm that the user has account and to provide the number. Here is our reply: Hello Latin Box, I'm sorry to hear that you've had trouble with your recent purchase. I see that you made a purchase on our website on 06/23/2023 using the email address [email protected]. I can confirm that the transaction was successful and a phone number has been assigned to your account. The phone number assigned to your account is 857xxxxx. You should have received a confirmation email regarding this. If you haven't received it, I recommend checking your spam or junk email folders. Sometimes, emails can be directed there. If you still can't find the confirmation email, or if you have any other questions or concerns, please don't hesitate to reach out. Best Regards,
AL
The product description clearly states: “The best part of all is it is a true mobile number. Meaning, you can activate services with it like PayPal, Facebook or WhatsApp.” However, upon using the service, I found that the number provided is being recognized as a VoIP number and was rejected by PayPal and other services for verification purposes. To make matters worse, I requested a refund by email in accordance with the 24 hour refund policy stated on their website. However, the developer refused to refund me and eventually started ghosting my emails. There are many similar reviews. it is truly a malicious service. Please DO NOT waste your money. Edit If you have time to respond to this review, I think you would be better off using that time to respond to your customers' emails.
Response from SLYNUMBERJun 24, 2025
Our numbers are classified as real mobile (non-VoIP) numbers at the carrier and network level. However, third-party platforms implement their own internal validation rules and filtering mechanisms, and they reserve the right to approve or reject any applicant at their sole discretion. This may impact whether a number is accepted or fully functional on certain services. All users can check on this link: https://www.npanxxsource.com/wireless-block-lookup.htm As we have said third party platforms reserve the right to accept or reject applicants. This is especially true for financial platforms as they are subject to tight regulations. We have thousands of customers that use us for Paypal, Facebook and WhatsApp. If the user had contacted us we will work with them to address the issue. We are not a scam and we stand behind our product. We offer support and the user always is welcomed to contact us.
Shoda S.
The service doesn’t deliver what it promises. Worse, when you try to cancel, the app and the website crash at the cancellation step — every single time. This isn’t incompetence; it’s a calculated move to keep customers trapped. It’s abusive, dishonest, and should be illegal. Do not give this company your money.
Response from SLYNUMBERJun 27, 2025
We provide support. If the user has encountered an issue while canceling we provide the support. This user account was actually canceled even though the web application crashed. There is no malicious intent behind this