Flex Mobile vs Optimum Mobile

By Rob Webber • Founder & Editor

Head-to-head comparison of plans, features, and pricing

Flex Mobile

Flex Mobile

T-Mobile network

$—/mo

0 plans available

Optimum Mobile

Optimum Mobile

T-Mobile network

$—/mo

0 plans available

Looking to switch carrier but not sure if Flex Mobile or Optimum Mobile is better? Within this guide, you'll be able to compare Flex Mobile and Optimum Mobile coverage, features, plans, and prices side-by-side, so you can decide which carrier offers the best deal.

Flex Mobile vs Optimum Mobile: Coverage & Plan Comparison 2026

  1. 1. Flex Mobile vs Optimum Mobile: Reviews
  2. 2. Flex Mobile vs Optimum Mobile: Plans
  3. 3. Flex Mobile vs Optimum Mobile: Coverage
  4. 4. Flex Mobile vs Optimum Mobile: Features
  5. 5. Our Verdict
  6. 6. FAQ

Flex Mobile vs Optimum Mobile: Reviews

Flex Mobile
Our Rating:
3/5
See Deals → View Plans

Pros

  • ✓ T-Mobile network coverage
  • ✓ Flexible plan options
  • ✓ No contract

Cons

  • ✗ Newer carrier
  • ✗ Limited track record
  • ✗ Basic features
Optimum Mobile
Our Rating:
3.2/5
See Deals → View Plans

Pros

  • ✓ T-Mobile 5G & 4G LTE network coverage
  • ✓ Bundled savings for Optimum Internet customers
  • ✓ No contract

Cons

  • ✗ Requires Optimum Internet
  • ✗ Limited availability
  • ✗ Mixed customer service

Flex Mobile vs Optimum Mobile: Plans

Flex Mobile Top Plan

Unlimited

$29/mo

Powered by T-Mobile

See at Flex Mobile →

Flex Mobile Plans

Optimum Mobile Top Plan

Unlimited

$45/mo

Powered by T-Mobile

See at Optimum Mobile →

Optimum Mobile Plans

Flex Mobile vs Optimum Mobile: Coverage

Flex Mobile

Flex Mobile is powered by T-Mobile 5G & 4G LTE wireless networks.

View Flex Mobile coverage map →

Optimum Mobile

Optimum Mobile is powered by T-Mobile 5G & 4G LTE wireless networks.

View Optimum Mobile coverage map →

Flex Mobile is powered by T-Mobile and Optimum Mobile is powered by T-Mobile. Coverage varies by location — check availability in your area.

Flex Mobile vs Optimum Mobile: Features

Feature Flex Mobile Optimum Mobile
Networks — —
Data Speed — —
3G Network — —
Mobile Hotspot — —
5G — —
VoLTE — —
WiFi Calling — —
Visual Voicemail — —
Bring Your Phone — —
Keep Your Number — —
Contract — —
Credit Check — —
Taxes Included — —
Multi-line Discounts — —
Multi-month Discounts — —
Money Back Guarantee — —
Customer Service — —
International Calls — —
International Roaming — —

Our Verdict

Flex Mobile is better for budget-conscious users who want plans starting at $0/mo on the T-Mobile network. Optimum Mobile is better if you want plans on the T-Mobile network starting at $0/mo. Both carriers offer the same tower coverage as Big Wireless at a fraction of the price.

Who Should Choose Flex Mobile

  • ✓ You want the T-Mobile network
  • ✓ Plans starting at $0/mo
  • ✓ 0 plan options to choose from
View Flex Mobile Plans →

Who Should Choose Optimum Mobile

  • ✓ You want the T-Mobile network
  • ✓ Plans starting at $0/mo
  • ✓ 0 plan options to choose from
View Optimum Mobile Plans →

Why You Can Trust This Comparison

I've spent years helping people ditch overpriced phone plans by exposing hidden fees and carrier tricks. At MoneySavingPro, we go beyond the fine print, testing and comparing real-world network performance so you don't have to.

I've personally tested Flex Mobile, Optimum Mobile, and other low-cost providers, comparing their speeds, coverage, and pricing to the Big 3. If there's a smarter way to save, you'll hear about it here first.

— Rob Webber, Founder & Editor

Compare Flex Mobile vs Optimum Mobile — How Much Could You Save?

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Frequently Asked Questions

Is Flex Mobile or Optimum Mobile cheaper?
Flex Mobile is cheaper, with plans starting at $0/mo. Optimum Mobile starts at $0/mo.
Which network does Flex Mobile use?
Flex Mobile uses the T-Mobile network. You get the same coverage as T-Mobile customers at a lower price.
Which network does Optimum Mobile use?
Optimum Mobile uses the T-Mobile network. You get the same coverage as T-Mobile customers at a lower price.
Can I keep my phone number if I switch to Flex Mobile or Optimum Mobile?
Yes. Both carriers support number porting. You can transfer your existing phone number in about 10-30 minutes during the sign-up process.
Do Flex Mobile and Optimum Mobile offer 5G?
Most modern plans from both Flex Mobile and Optimum Mobile include 5G access at no extra cost where the network supports it.