What's best: SIM only or pay monthly?

How to choose the right mobile phone contract

Choosing a new phone contract can feel overwhelming. With so many deals, features and bits of small print to consider, it’s not always clear where to start.

The key is to focus on what you actually need. Once you understand how you use your phone, it becomes much easier to narrow down your options and find the right deal.

Start with your phone usage

Before comparing contracts, think about how you use your phone day to day.

• Do you stream videos, scroll social media and rely on mobile data?

• Or do you mostly use your phone for calls and the occasional message?

Your usage will help determine whether you need lots of data, unlimited calls, or just a basic plan. Getting this right means you won’t overpay for extras you don’t need — or run out of allowance when you need it most.

Finding the right fit

The best contract is one that matches your usage without wasting money.

Choose wisely and you’ll avoid paying for unused data or facing extra charges for going over your limits.

If you’re unsure which option suits you best, don’t worry — we’ll walk you through the main types of mobile contracts.

SIM-only deals

What is a SIM-only deal?

A SIM-only deal gives you a SIM card with a monthly allowance of data, minutes and texts — but no handset.

How they work

You pay a fixed monthly fee for your allowance. These plans are usually simple and often cheaper than contracts that include a phone.

SIM-only deals can start from as little as £5 a month, often including generous data and unlimited calls and texts. Contract lengths vary, with options ranging from 30-day rolling plans to 12- or 18-month agreements.

Why choose SIM-only?

SIM-only deals are a great option if you already have a phone and want to keep costs down.

• Flexible: Many plans are rolling monthly, so you can switch or cancel easily

• Affordable: No handset cost keeps prices low

• Accessible: Some deals don’t require a credit check

Things to consider

• You’ll need to supply your own phone

Pay-monthly phone contracts

What is a pay-monthly contract?

A pay-monthly contract bundles a new handset with your data, minutes and texts into one monthly payment.

Spreading the cost

Instead of paying upfront for a phone, you spread the cost over the length of your contract — typically 12 to 24 months.

Some providers clearly separate handset and airtime costs, so you can see exactly what you’re paying for. Once the contract ends, your monthly cost may drop.

Why choose pay-monthly?

• No upfront handset cost

• Predictable monthly payments

• Perks and incentives (like rewards or freebies)

Things to consider

• You’ll usually need to pass a credit check

• Contracts can be long, making it harder to switch

• You may pay more overall compared to buying a phone outright

Pay-as-you-go (PAYG)

How does pay-as-you-go work?

With pay-as-you-go, there’s no contract. You simply top up your phone with credit and use it as needed.

Some providers also offer bundles that give you a set amount of data, calls and texts for a fixed price.

Why choose PAYG?

This option works well if you don’t use your phone often or want maximum flexibility.

• No contract or monthly commitment

• No credit check required

• Good for light users

Things to consider

• You’ll need your own handset

• Costs per minute, text or data can be higher

• Heavy users may find it more expensive than other options

Final thoughts

There’s no one-size-fits-all mobile contract. The right choice depends on how much you use your phone, whether you need a new handset, and how much flexibility you want.

Take a moment to assess your habits, compare your options, and you’ll be in a much better position to find a deal that truly works for you.