Recently, a coworker showed me their phone bill and bragged that they only pay $30 a month.

At first, I thought it must be some limited-time promotion, but it turned out to be their regular monthly rate.

More and more people are using these plans, which are known as MVNOs, or budget phone plans.

MVNOs are companies that sell services by renting networks from major carriers like Verizon, T-Mobile, and AT&T instead of building their own communication towers.

So when you make a call or use data, the signal passes through the same towers as those used by customers of the major carriers. You don't have to worry about coverage.

However, not all budget phones are the same. Some independent budget phone companies, like US Mobile and Visible, have no capital ties to major carriers, while others, like Cricket Wireless and Metro by T-Mobile, are low-cost brands directly operated by major carriers.

Cricket is a subsidiary wholly owned by AT&T, and Metro by T-Mobile is a prepaid brand directly operated by T-Mobile, meaning the network owner is also the service provider.

In terms of pricing, Cricket's 12-month contract unlimited plan is around $25 a month, and Metro by T-Mobile also offers an unlimited 5G plan for $25 a month with auto-pay. They are just as affordable as independent budget phones.

Since they don't need to build and maintain their own towers, their operating costs are lower, and that savings is passed on to customers as lower rates.

In fact, MVNO rates are typically set 40 to 60 percent lower than the standard rates of major carriers.

For a typical individual line, postpaid rates range from $70 to $100 a month, and unlimited data plans can go as high as $80 to $120.

However, on the budget phone side, unlimited data plans are priced around $25 to $30, making a significant difference.

One of the places I found, US Mobile, offers an unlimited plan for $25, including taxes, and you can choose from Verizon, T-Mobile, or AT&T networks and switch directly through their app.

Visible also has a similar unlimited plan for $25, and since it uses the Verizon network, you can enjoy Verizon's high-speed 5G network at half the price.

If you need more extensive benefits, there's also a higher plan called Visible Plus, which costs $45 a month.

The $30 mentioned in the title of this article actually corresponds exactly to Mint Mobile. The standard renewal price for a 12-month plan is exactly $30 a month.

However, the $15 often advertised by Mint Mobile is a limited-time offer that only applies when you pay for a year upfront, so at renewal, it goes back up to $40 for three months or $35 for six months.

Many people are surprised when they see the renewal bill after signing up based on the initial discount, so it's a good idea to check the contract period and renewal rates separately.

If you don't use much data, there are even cheaper options like Tello. They offer 1GB for $5 and 5GB for around $10.

Within Tello, there's a plan without a hotspot that offers 20GB for $18.99, and a completely unlimited plan for $35.99, so you can choose based on your usage.

For those who use a lot of data but find comparing complex plans tedious, Consumer Cellular is often mentioned. Their unlimited plans range from $35 to $60 a month, and you can choose your plan by speaking directly with a representative, making it especially popular among older adults.

In fact, for workers who frequently use Wi-Fi at home or work, it's common not to exceed 10 to 15GB a month. Yet, I see many people maintaining plans over $100 just because they are attracted to the term unlimited.

Of course, budget phones aren't without their downsides. They often don't have physical stores, so if issues arise, you usually have to resolve them through an app or chat.

If multiple family members are using the service, the family discounts offered by major carriers can be quite significant, so in that case, switching to a budget phone might not make as much of a difference, so it's best to calculate beforehand.

Before switching, you should check the coverage map to see if the carrier's network works well in your area. Even with the same network, signal quality can vary by location.

These days, many people test the service with an eSIM first, and if there are no issues, they then transfer their number, which is worth considering.

Before fully transferring my number, I used an eSIM for about a week to check if there were any signal dropouts during my commute or at home. Once I confirmed there were no issues, I deactivated my old SIM, which made me feel much more at ease.

This kind of information never appears on the advertisements of major carriers. So, I make it a point to share this information with people around me who don't have time to research plans.

If it were me, I would lean more towards US Mobile, where you have the freedom to choose your network, but no matter which option you choose, it's a good idea to start by comparing it to your current plan.