What Is a Bolt-On? Mobile Add-Ons Explained

What Is a Bolt-On?

A bolt-on (sometimes called an add-on) is an extra package you add to your existing mobile plan to get additional allowances beyond what your contract includes. Rather than upgrading your entire plan, a bolt-on lets you top up a specific feature — such as data, international minutes or roaming — for a fixed monthly or one-off cost.

Bolt-ons are available on all major UK networks including EE, Vodafone, O2 and Three, and are used by both personal and business customers.

Types of Mobile Bolt-Ons

There are several categories of bolt-on, each designed for a different need:

Bolt-On Type	What It Includes	Typical Cost
Data bolt-on	Extra GB of mobile data	£3–£15/month
International bolt-on	Minutes to call overseas numbers from the UK	From £5/month
Roaming bolt-on	Data, calls and texts for use abroad	£2–£6/day
Entertainment bolt-on	Streaming services such as BT Sport on EE	Varies
Insurance bolt-on	Device protection against loss, theft or damage	From £7/month

Data Bolt-Ons

By far the most popular type. If you regularly run out of data before the end of the month, a data bolt-on gives you an extra allowance — typically from 500 MB up to 10 GB — without changing your plan.

International Bolt-Ons

If you make regular calls to friends, family or business contacts abroad, an international bolt-on bundles minutes to selected countries at a much lower rate than standard international call charges.

Roaming Bolt-Ons

When you travel outside the UK (or outside the EU on plans that no longer include free EU roaming), a roaming bolt-on gives you a daily or weekly pass so you can use data, calls and texts abroad at a predictable price.

Entertainment & Insurance Bolt-Ons

Some networks offer streaming subscriptions or device insurance as optional extras. These are added to your monthly bill alongside your airtime charges.

How Bolt-Ons Work

• Added to your bill: The cost of a bolt-on appears on your next monthly bill (or is deducted from pay-as-you-go credit).
• Auto-renewal: Most recurring bolt-ons renew automatically each month until you cancel them.
• Cancel anytime: You can remove a recurring bolt-on through your network app or by calling customer services. It stays active until the end of your current billing cycle.

One-Off vs Recurring Bolt-Ons

It is important to understand the difference:

• One-off bolt-ons — a single data top-up that expires after 30 days or once used. It does not auto-renew and cannot be refunded once purchased.
• Recurring bolt-ons — renews every month and is charged to your bill until you cancel.

Bolt-Ons for Business Customers

If you manage a business mobile fleet, account administrators can add bolt-ons across multiple lines from a single portal. This is useful for adding roaming passes before team travel or extra data for remote workers. Connection Technologies can manage this on your behalf, ensuring the right bolt-ons are on the right lines — and removed when they are no longer needed.