Business Mobile Contract Lengths Explained: 30-Day vs 12 vs 24 Months

Published: 3 March 2026 • Compare The Networks

Choosing the right contract length for your business mobile is one of the most important decisions you’ll make — and one that many businesses get wrong. Too long and you’re locked into a deal that might not suit you in 12 months. Too short and you’ll pay more per month than you need to. This guide breaks down the three main contract lengths — 30-day rolling, 12-month, and 24-month — so you can pick the right one for your business.

Whether you’re a startup looking for flexibility or an established business wanting the lowest possible monthly cost, understanding contract lengths will save you money and frustration.

The Three Contract Lengths at a Glance

Business mobile contracts typically come in three lengths. Here’s a quick comparison before we dive into the detail:

30-Day Rolling Contracts: Maximum Flexibility

A 30-day rolling contract means you’re never locked in. You can cancel with just 30 days’ notice — no penalties, no early exit fees. This makes it the most flexible option, but you’ll typically pay a premium for that freedom.

Pros:

• Cancel or switch anytime — ideal for startups that aren’t sure what they need yet
• No early exit fees whatsoever
• Perfect for temporary staff, contractors, or seasonal workers
• Only one CPI + 3.9% price increase at most (in April) before you could switch
• No credit check required on SIM only plans
• Test a network’s coverage before committing long-term

Cons:

• Higher monthly cost compared to 12 or 24-month contracts — typically £2–£5 more per month
• Almost always SIM only — handset contracts are rarely available on 30-day terms
• Less predictable for budgeting across the year

Typical pricing: SIM only from £8/mo for 10GB, unlimited data from £14/mo.

12-Month Contracts: The Middle Ground

A 12-month contract strikes a balance between flexibility and value. You commit for one year and get a lower monthly rate than 30-day, but you’re not locked in for a full two years. This is the most popular choice for small and medium businesses.

Pros:

• Lower monthly cost than 30-day rolling
• Only one annual CPI + 3.9% price increase during the contract
• Available as SIM only or with a handset
• Reasonable commitment — your business needs are unlikely to change drastically in 12 months
• Review and renegotiate annually to ensure you’re always on the best deal

Cons:

• Early exit fees apply if you want to leave before 12 months — typically the remaining monthly charges
• Still more expensive per month than 24-month contracts
• Handset choices may be more limited than 24-month deals

Typical pricing: SIM only from £6/mo for 10GB, unlimited data from £10/mo, handset contracts from £15/mo.

24-Month Contracts: Lowest Monthly Cost

A 24-month contract offers the lowest monthly rate and the widest choice of handsets. Networks can spread the cost of an expensive phone over two years, which means lower monthly payments. However, you’re locked in for a long time — and you’ll face two annual price increases.

Pros:

• Cheapest monthly rate — especially for handset contracts
• Widest selection of handsets, including flagship models
• Predictable costs for long-term budgeting (aside from annual increases)
• Ideal for established businesses that know exactly what they need

Cons:

• Two CPI + 3.9% annual price increases during the contract. On a £30/mo plan, that could add £2–£3/mo by the second year
• Significant early exit fees — leaving after 6 months could mean paying 18 months of remaining charges
• Your business needs may change significantly over 2 years
• Technology moves fast — you might want a newer phone before the contract ends
• Consider leasing vs buying if you want to upgrade mid-contract

Typical pricing: SIM only from £6/mo, unlimited data from £10/mo, handset contracts from £15/mo.

How CPI + 3.9% Price Increases Affect Your Contract

Every business mobile contract in the UK now includes annual CPI + 3.9% price increases, applied each April. This is an industry-wide practice across all major networks. Here’s how it impacts each contract length:

This is a key consideration. A 24-month contract that looks cheap today will cost more by the end than you initially budgeted. If price predictability matters to your business, a shorter contract with the option to renegotiate may be smarter.

Early Exit: What Happens If You Want to Leave?

Leaving a contract early comes with penalties. Under OFCOM regulations, the early termination fee is typically the remaining monthly charges for the rest of your contract. Some networks may offer a reduced exit fee, but you should always check the terms before signing.

If you want to switch business mobile provider, the process is straightforward once your contract ends (or if you’re willing to pay the exit fee):

1. Text PAC to 65075 to get your PAC code (free, takes 60 seconds)
2. Give the PAC code to your new provider
3. Your number transfers within 1 working day
4. Your old contract is automatically cancelled

Which Contract Length Should You Choose?

Here’s a quick decision framework:

• Choose 30-day if you’re a startup, need phones for temporary staff, or want to test a network before committing
• Choose 12-month if you want a balance of value and flexibility, especially for SIM only plans
• Choose 24-month if you need a handset, know exactly what you want, and are comfortable with two annual price increases

All prices shown exclude VAT. Annual CPI + 3.9% price increases apply to all tariffs. Compare The Networks is regulated by OFCOM.