My Optimum Mobile Review (2026): A Service Mostly for Optimum Internet Customers

For all our mobile reviews, we give a rating based on four main criteria:

• Dollar value ↓
• Network coverage ↓
• Data performance ↓
• Customer service ↓

Then, we average the scores to make an overall score.

Optimum Mobile is the service for you if you want multiple cell phone lines or have Optimum Internet already. The service has good 5G coverage from T-Mobile but can be deprioritized, and the customer experience often leaves something to be desired. So if you can’t get a nice multi-line or internet bundle discount, it’s not worth it.

Here’s a quick overview of what you can expect from an Optimum Mobile cell phone plan:

• Access to T-Mobile’s large 5G network
• Unlimited talk and text
• Unlimited data (with Unlimited plans)
• Significant savings with multiple lines
• Third line free (on Unlimited plans with code BIGSAVINGS)
• 24/7 customer service

With Optimum Mobile, you typically have to make an additional purchase to get service abroad (aka international roaming). When abroad, most Optimum customers should buy an Optimum international Travel Pass, which includes data. Optimum adds the cost of your purchase to your monthly bill.

Optimum Travel Passes cost between $10 and $100, depending on the country you’re in and whether you want international service for a day or a week. Make sure you select the right pass group (A, B, C, or D) to get service that works in your destination.

Optimum Mobile data performance can vary based on time, location, and other circumstances, making it somewhat unreliable.

Optimum’s advertised download speeds are between 80 and 382Mbps for 5G service and 19 and 76 Mbps for 4G LTE service. That’s pretty good. However, Optimum Mobile customers can struggle with connection, suggesting that data speed is commonly at the lower end of the range. This isn’t too surprising. As a mobile virtual network operator (MVNO), Optimum is deprioritized on T-Mobile’s network. That means at peak hours or when you’re surrounded by a lot of T-Mobile customers, you’re second in line for network access. But even though this slowdown is expected, it can still be frustrating, especially when you really need to get online.

You can generally expect faster speeds before your monthly premium data allotment runs out (it’s between 1 and 50GB, depending on your plan). But after that, all bets are off.

Optimum Mobile makes signing up and checking your monthly bills quick and easy, and it offers 24/7 customer service, but you may still run into bumps when you have a serious issue or need to cancel.

You can sign up for Optimum Mobile online, and it’s easy to check your bills or look at your data usage in the My Optimum app. However, it’s not always easy to get help with a billing or service question. Some customers complain of getting the runaround, especially when trying to cancel service. There are even cases where Optimum customers pretend to move overseas or die in order to make the cancellation process easier.

If you like T-Mobile’s awesome 5G coverage, you don’t have to go with Optimum. You could try signing up for T-Mobile itself and get the same great network, albeit at a higher cost. Or you could try some of T-Mobile’s other MVNOs, like Mint Mobile or US Mobile.