The reference drawer

Where the live answer belongs

Research checked on 20 October 2026. These are official starting points, not referral links. Your current account documents and the provider’s live instructions should be read alongside our independent explanations.

Regulator material

• Ofcom: mobile switching
• Ofcom: mobile coverage
• Ofcom: scheduled contract changes

Three

• Three official material
• Three SIM and eSIM
• Three switching

O2

• O2 official material
• O2 eSIM
• O2 PAYG

EE

• EE official material
• EE digital SIM guidance
• EE PAYG support

Vodafone

• Vodafone official material
• Vodafone PAYG Plus
• Vodafone eSIM

Sky Mobile

• Sky Mobile official material
• Sky launch background
• Sky eSIM

Tesco Mobile

• Tesco Mobile official material
• Tesco background
• Tesco eSIM help

giffgaff

• giffgaff official material
• giffgaff eSIM
• Broadband switching

SMARTY

• SMARTY official material
• SMARTY digital SIM

iD Mobile

• iD Mobile official material
• iD roaming
• iD rollover

VOXI

• VOXI official material
• VOXI eSIM
• VOXI feature terms

Lebara

• Lebara official material
• Lebara eSIM

Lyca Mobile

• Lyca Mobile official material
• Lyca eSIM
• Lyca number move

Talkmobile

• Talkmobile official material
• Talkmobile eSIM and network

Asda mobile

• Asda mobile official material
• Asda current services

BT Mobile

• BT Mobile official material
• BT’s current mobile context

TalkTalk

• TalkTalk official material
• Mobile support category

1pMobile

• 1pMobile official material
• 1pMobile current help

spusu

• spusu official material
• spusu example contract summary
• BT Wholesale network context