really great service. Patient very helpful. Highly recommend. I am t mobile customer for 9 yearsread more

From the owner: Visit the T-Mobile store in Mount Sinai and discover America's largest, fastest, and most reliable…read more5G network. Shop our best low-cost plans with no annual service contracts - plus our best smartphones, cell phones, tablets, internet devices, and latest promotions. If you're interested in joining the Un-carrier, our staff at 5507 Nesconset Hwy Ste 19 can assist you in the switching process. Masks are optional for fully vaccinated guests except where state or local ordinances require all guests wear a mask at all times.

I was in the store today trying to get my elderly mother a new phone (had the same phone for 15yrs)…read moreRaza was unbelievably helpful and knowledgeable and made a stressful situation very easy to deal with .. Thank you

Great store amazing staff , I received a buy one get one free offer pleasant experienceread more

When our agency moved, we used Dave and Rob to install our phone system. They are the best!…read moreWhenever we have a question or a problem, they always respond very fast and come by to diagnose the problem. We are very happy with their service! Go with them, you won't regret it!

From the owner: Sales, Installation, Service of NEC DSX, SL1100 and SV9100 Systems…read moreSurveillance Systems Access Control Systems Avaya Partner Systems Hosted systems VoIP services SIP service COMDIAL / Vertical systems

We are a small company of about 10 ppl and we moved and had Master Telecommunications set-up our…read morephone systems and paging system for 2 of our warehouses. Mr. Vadim was very pleasant to work with. His customer service is amazing. Even the after service. I definitely recommend Master Telecommunications.

From the owner: Telephone systems installation. Telephone system repairs…read more Phone system service. Office telephone systems. Business phone system. AVAYA telephone systems repairs. NEC telephone systems repair. Panasonic telephone system repairs. Samsung telephone systems repairs. Telephone systems sales. Best telephone systems. Phone system for small office.

they used to give nice promos to keep costs down…read more Now they just promise you promos that don't happen. And if you like baseball, MLB is gone. But you're still paying. bill skyrocketed by almost 70$ in December- called to get promo and was promised a fixed rate for as long as we kept the triple play service that we have. you read that right. As long as we don't leave, Optimum we will pay the same fixed lowered price without ever having the price go up again. yeah, it sounded too good to be true, and of course, it was. that call was January. Another rep said they would give me three months credit, and apologized for the previous person who promised something that they said they don't offer....but THAT that never happened, either. I could go on and on, but the stories are all the same, they lie they lie and then they lie some more - then they put you on hold and come back and say some more lies. That's really what they do. Go on Reddit and you'll see what real people that used to work there say: people that stopped working there because they had a conscience and felt bad lying to people: They said that they were told to say whatever was necessary to keep someone from leaving even if that meant promising promos that they couldn't actually honor. That is exactly what happened to me and countless others here on Yelp- I have screenshots of everything proving that I should've had a promo worth X amount of dollars.... that never materialized. I spoke to numerous other customer service reps who all gave me different stories, and it was just a run around whether it was the retention center or customer service. They don't care. Yeah, they'll come on here and reply to your negative review asking you to contact them at an email address that they're going to post and, don't even bother doing it. Because then you'll be going back-and-forth by email while the person on the other end is getting paid, wasting your time yet again. Remember, they record all the phone calls and then they tell you that you were never promised anything. That's when you have to tell them to go and listen to the calls and make sure you write down the time you called and the date that you called - and the first name of the person that you spoke to. They record everything. EVERYTHING. WHEN YOU FIRST CALL, IT SAYS THAT THEY ARE RECORDING THE CALL FOR QUALITY ASSURANCE! Quality assurance doesn't EXIST with Optimum. I'm sure the FCC and the FTC might be interested in hearing about this...maybe even the Senator, too. people you need to fight back... To anybody that was promised a promo, the day before the bill drops, turn auto pay off - and pay the promo price that you were promised, don't leave auto pay on. I made the mistake of leaving it on and they took the full amount. I was never compensated two months in a row now..... In the meantime, looking into other options because I'm tired of doing this, spending hours on the phone wasting time with people who getting paid on the other end to waste it. REMEMBER THAT. THEY GET PAID TO WASTE YOUR TIME AS LONG AS THEY DON'T LOSE YOUR BUSINESS..... LET IT SINK IN AND THEN RUN FROM THEM.

This evaluation doesn't reflect one location but on Optimum itself…read more My family has been an Optimum customer for over twenty years. We've principally been customers of their cable tv service and internet. Optimum appears to have the majority of service on Long Island, NY, except for Verizon Fios and Direct TV. The following is a commentary on their cable tv service. Sadly, Optimum's services have been poor only exceeded by the lack of incompetent technical support. Trying to reach live tech support is almost impossible. When calling, you enter an AI driven queue with options to select tv, internet or phone. Once the tv option is selected, break-out from the queue to reach live support is almost impossible. The AI script forces a reboot of your cable box(es) when I've done this before with no change. The AI script directs the customer to tune to channel 900 ignoring the fact that you can't since the DVR box is non-functional. How stupid! If you reach a tech, most often they want to do a physical reboot of the cable tv system even though I've told them this was done. Often unable to proceed, the tech representative wants to dispatch a field tech often at possible expense to the customer for a home call. My background in IT is certified so I understand what is occurring. Occasionally, I get telephone disconnected in the process requiring me to start all over again with another "tech" promising we won't have to repeat the steps and he'll resolve the problem- I have yet to see this. Their cable package is excessively priced - I had the platinum plan I called Customer Retention to downgrade to a basic package. They offered to extend the amount of channels (40 more) at no further charge to about 120. NOTE: 25% of these channels are reality shows, 25% are shopping, 25% are sports - and I don't need any of these. I'm left with low-band basic such as channels 2,4,5 etc. The DVR boxes are poor quality and the remote transmitter has a narrow bandwidth requiring you to be spot on when aiming. Dealing with the billing department reflects their lack of accuracy. They stated I had four DVR boxes for which I was billed monthly for the fourth box. I never had a fourth box and had to go through the trouble of capturing the serial numbers so they could determine what I had on my account. They ultimately agreed I only ever had three and couldn't identify who ordered the fourth. I was promised a refund for the monthly rental of that fourth box - one year later I'm still waiting! No Refund. When troubleshooting no video signal, the tech support agent switched me to Sales who pressured me to switch to wireless while stating that my recordings on the cable level, stored in the cloud, wouldn't be lost. WRONG! I questioned the sales agent re: wireless who verified what I already knew - I would lose all previous recordings as wireless is stored on another cloud server. The sales agent stated this was true wireless. NOPE! I interrupted and explained all Optimum is going to do is run a fiber optic cable from the pole to my house. The sales confirmed as such. However, I asked the sales representative to confirm that the end of the fiber optic cable reaching the house would connect to a hand-off block merely connecting the fiber cable to the copper leads of the existing copper cable throughout my home. This is not true fiber optic She stated that I knew the tech ends. Fiber Optic is cost prohibitive to install actual fiber optic throughout my entire home. The sales agent offered a price but said I had to place the order with her while she was on the phone. I explained I needed time to consider and she remarked that if I called back she couldn't guarantee I would get her "special offer." I told her it's the same account, just note her pricing in my account records. Their business office is in disarray. I'm firmly convinced that the tech representatives merely read repair instructions off their computer systems When in the military, I lived off-post in a garden apartment complex. I called Optimum to set up basic cable. I was promised service in a second room at no extra charge. The tech arrived and proceeded to tack cable to baseboards because it was fast. This is very old procedure -at least twenty years old. The management office of the apartment complex told me tacking cable to baseboards was prohibited because this was considered damage for which I'd be liable. The tech was unwilling to go outside and enter the crawl space where all optimum lines were located and coded per apartment. Eventually, he followed procedure but explained I'd be billed for the second box. I informed him that he was wrong. I was fortunate to call an Optimum District Manager who verified I was right and told the tech to complete the installation properly. Does it get worse? Absolutely, but the space I'm allotted for this evaluation is limited. Summary: Optimum requires a serious makeover.

Marie was the super helpful figuring out a way to get a replacement phone at a low cost. She's…read moresuper efficient, knew what she was talking about and told us what promotions they had without trying to over sell us. thank you girl !

From the owner: Switch today & enjoy America's largest 5G network.read more