There are five major mobile network operators all of these maintain their own networks.

• (3) Three (2100MHz)
• O2 (900 MHz)
• Orange (1800MHz)
• T-Mobile (1800MHz)
• Vodafone (900MHz)

There are many virtual operators in addition to those above. These virtual mobile phone networks actually use the infrastructure of the big five. Here's a list:

• Virgin Mobile use T-Mobile's network
• Tesco Mobile use 02
• Blyk use Orange
• Vectone Mobile use T-Mobile
• LycaMobile use Orange and 02, depending on certain factors
• Talkmobile (The Carphone Warehouse) use Vodafone
• BT Mobile use Vodafone
• ASDA Mobile use Vodafone
• abica use 3, Orange, and T-Mobile
• Lebara Mobile use Vodafone's network
• Giff Gaff use 02
• Family Mobile (IKEA) use Tmobile