How to calculate the real cost of keeping a phone versus replacing it

Calculating a phone’s real cost involves more than its sticker price. To make an informed decision, you need to set a clear time horizon, generally between two and five years, over which to weigh the initial investment against recurring expenses. This period should align with the expected life of the hardware and the manufacturer’s support commitments, so the comparison remains fair and realistic.

The initial cost includes the purchase price, but also the estimated residual value at the end of the period. Unlike many other assets, a phone depreciates quickly and unevenly, so assuming that you are guaranteed a particular resale price is a common mistake. Base the decision on actual cash flows: how much you spend now and how much, if anything, you may recover later, taking market uncertainty into account.

Key variables in the calculation

• Purchase price: Net cost after discounts or subsidies.
• Maintenance costs: Repairs, accessories and insurance.
• Residual value: Projected second-hand market price.
• Opportunity cost: The lost benefit of using an outdated device.

Software support is the most important factor in a device’s security and longevity. By 2026, the industry has extended support cycles: Samsung, Google and Motorola offer up to seven years of security updates for their premium ranges. This commitment, set out in official product information, can radically change the financial equation by postponing replacement and protecting users against emerging vulnerabilities.

It is essential to distinguish between operating system updates and security patches. A device may stop receiving new versions of Android while continuing to receive vulnerability fixes for months or years. Check the exact policy on the manufacturer’s website: terms vary by region and specific model, so read the conditions carefully.

For example, models launched in 2021 have begun to lose official security support in 2026. The phone may still work, but it is accumulating unpatched cybersecurity risks. For users, this is not merely a technical issue; it is a risk cost to weigh against the expense of replacing the phone early, while considering exposure to potential digital threats.

The battery is the component most likely to require attention. A common misconception is that normal wear is covered by the warranty. In reality, the three-year warranty covers manufacturing defects only; degradation through everyday use is the owner’s responsibility. A battery replacement is therefore a foreseeable recurring expense that should be included in the budget from the start of the device’s life.

Official out-of-warranty battery replacement prices have risen significantly. For a premium phone, the cost can be around 100 euros, a figure worth comparing with the price of a new mid-range device. Official repair services, such as Samsung’s or Phone House’s, offer fixed prices and a repair warranty, adding reassurance and helping avoid surprises on the final bill.

Comparing repair services

A phone’s depreciation does not follow a fixed mathematical formula. It depends on second-hand demand, brand reputation and the availability of replacement parts. Observed selling prices on comparison sites such as Kimovil or Compra Smartphone are the only reliable reference; manufacturers’ theoretical estimates tend to be optimistic and do not reflect the experience of the average buyer.

A device loses most of its value in the first 12 months. The curve then levels off, but the residual value continues to fall. For a total-cost calculation, it is prudent to use a conservative resale scenario: assume the device will sell for less than its original price, or may not sell at all, to avoid overstating future income.

Depreciation also shapes how valuable a phone feels. An older phone may still work perfectly yet have less psychological value to its owner, influencing the decision to replace it. Although subjective, this factor belongs in the cost-benefit analysis because satisfaction with a device directly affects the willingness to keep it over the long term.

When deciding whether to keep or replace a phone, it helps to model two scenarios: keep the current device for another two years, or buy a new one now. In the first case, add the expected repair costs, such as a battery or screen replacement, and the risk of obsolescence. In the second, add the new phone’s purchase price and subtract the old phone’s residual value, creating a direct comparison of cash flows.

If the current device still receives security patches and its battery works properly, keeping it is usually cheaper. However, if the battery fails or security support ends, repair costs may exceed the residual value. Replacing the phone may then be the more economical long-term option, as well as the safer one for the user.

The decision also depends on how the phone will be used. Someone who needs performance for gaming or professional work may justify replacing it early, while a basic user can extend its life with a new battery, making better use of the initial investment and reducing environmental impact.

It is important to remember that repair prices and resale values are dynamic variables. Official rates can change without notice, and the second-hand market fluctuates with supply and demand. Any calculation should therefore be reviewed periodically to keep it accurate and relevant to current market conditions.

In addition, the cost of RAM and other components has risen, which could affect the prices of new devices. Pressure on the electronics supply chain is an external factor that can change the financial equation at any time, affecting both repair costs and launch prices.

Finally, there is no universal model for calculating a phone’s real cost. Each user should tailor the analysis to their needs, budget and risk tolerance. Transparent information and verification against official sources are the most effective tools for making an informed decision that remains sustainable over time.