Work phones
Business SIMs — when the extra shop is worth it.
A sole trader who already likes giffgaff can stay there. A company that needs bills, named admins and a broken-phone process wants EE, O2 or Vodafone Business.
Consumer SIMs are fine for one person who expenses a phone. The moment you need three lines, a VAT invoice, or someone else to unlock a SIM, use the business button on EE, O2, Vodafone or Three.
BT Business sits on EE coverage. Virgin Media O2 Business sits on O2. Value brands in this guide are not business suites.