When you switch internet or mobile providers, or get fiber optic internet installed for the first time at home, it can be a great time to get a new phone . For years, the "free phone" culture made switching operators the main way to upgrade your device in Spain. Today, although marketing practices have evolved, the temptation to get a new phone when signing up for a new telecommunications package remains strong.
Traditionally, when looking to improve our home internet and mobile lines, switching providers and including the phone is one of the most popular options. However, to avoid financial pitfalls or overpaying in the long run, it's worth carefully considering whether this is truly a cost-saving opportunity or if it's more advantageous to completely separate the phone purchase from our telecommunications contract.
The real cost behind convergent promotions

In today's market, nothing is free; practically no company gives away mid-range or high-end smartphones without any strings attached . In the vast majority of cases, what major carriers offer is financing for the device integrated into the monthly bill. Financing a phone isn't inherently bad; it's a convenient way to avoid a large upfront payment. However, the problem arises with the terms and conditions associated with this financing and the interest rates charged in some cases, which can lead you to pay more than the phone itself costs.
Often, to access the "discounted" monthly fee for a device, the operator requires you to sign up for a bundle with their top-tier plan (including high-speed fiber optic internet and unlimited data), which the user may not even need. This is compounded by long-term contracts that can extend to 12, 24, or even 36 months, both for the service and the device itself. If you decide to leave early, the immediate payment of the remaining installments without the discount or the early termination fees can drastically increase the cost.
Numbers do not lie
To clearly visualize the economic difference, let's analyze two example scenarios for a user looking for a 300 Mbps fiber connection, a mobile line with about 30 GB and a mid-range smartphone with a market price of around 300 euros:
- Option A (Smartphone linked to a convergent tariff): The company requires a fee of 55 euros per month to provide access to a promotional terminal fee of 5 euros per month for 24 months.
- Total monthly cost: €60/month.
- Total cost over 2 years: €1.440.
- Commitment: 24 months of mandatory stay on a high tariff.
- Option B (Adjusted rate + financed unlocked mobile): The user contracts a tariff adjusted to their actual consumption for 28 euros per month and acquires the same unlocked smartphone financed at 12,50 euros per month for 24 months without interest.
- Total monthly cost: €40,50/month.
- Total cost over 2 years: €972.
- Ties: no commitment to the tariff or the terminal.
In this practical example, separating these two decisions results in a direct saving of €468 over two years . The user enjoys the exact same service and phone, but retains the freedom to change or downgrade their plan at any time.
Variety of brands and the advantage of unlocked devices
Another crucial factor is freedom of choice . By committing to a major carrier's exclusive offers, you're limited to the catalog and stock the company promotes that quarter. This can force you to choose a specific model when you might prefer alternatives with excellent value for money from brands like Samsung, Xiaomi, Google, Motorola, etc.
In contrast to inflexible tariffs, alternatives have emerged that prioritize transparency. Operators like Simyo exemplify this philosophy by allowing customers to purchase unlocked mobile phones through interest-free financing with no contract length. This way, users can choose the latest models from top mobile device manufacturers, paying comfortably in installments, while maintaining the freedom to configure and adapt their fiber and mobile plans to their actual needs at any given time.

When is it worthwhile and when is it better to decline?
To make the right decision, you can use this simple guide before signing any contract:
It's worth it if:
- The required rate exactly matches the fiber speed and gigabytes you had already planned to contract.
- The actual discount on the terminal's RRP far exceeds the price difference in the tariff during the contract period.
- The financing is at 0% real APR, with no opening fees or high final payments.
It's not worth it if:
- It forces you to contract a package with oversized services that you will not use.
- The commitment period extends to 36 months, tying you to prices that can quickly become outdated for three years.
- The terminal includes operator software customizations that delay system updates.
Frequently asked questions about renewing your mobile phone contract with an operator
Is it a good idea to change my mobile phone every time I sign up for fiber and mobile service or when I switch providers and get a new phone?
Not always. In some cases, financing a mobile phone can increase the cost of the plan or involve conditions that should be carefully reviewed before signing up. Therefore, it's advisable to analyze fiber optic and mobile service contracts separately from smartphone upgrades, comparing the total cost of the device and service over time. Operators like Simyo allow you to purchase unlocked phones with interest-free financing and no contract commitments, making it easier to separate these two decisions.
What are the advantages of buying an unlocked mobile phone from an operator like Simyo compared to a subsidized device?
An unlocked mobile phone financed with no interest and no contract tied to the device allows you to change your plan or even your carrier without penalties. Furthermore, you avoid paying inflated monthly fees for fiber optic or mobile data packages you don't really need, ensuring a fair and transparent price for both the service and the device.
Conclusion
Upgrading your smartphone is exciting, but it's important to keep the big picture in mind. When considering switching providers or renewing your contract, always calculate the total cost of both your phone plan and the device itself over the entire contract period. Keeping your phone purchase separate from your fiber and mobile service contracts is usually the safest way to save money and avoid getting locked into inflexible deals.