Why eSIM
An eSIM (embedded SIM) installs digitally — no physical card. Activate via QR code, get a UK number + data plan, all within minutes. No SIM-swap, no UK address needed.
- Activate before you fly
- No roaming fees
- Keep your home number on SIM 1 for calls/SMS
- Add UK eSIM as SIM 2 for data
Top eSIM Providers
| Provider | 1GB/7 days | 5GB/30 days | Unlimited | Network |
|---|---|---|---|---|
| Airalo | $4.50 | $11 | N/A | Three/EE |
| Holafly | N/A | $19 (unlimited 5 days) | $69 (30 days) | Three |
| Nomad | $5 | $10 | N/A | EE/O2 |
| Saily | $3.99 | $9 | N/A | Various |
| Ubigi | $5 | $10 | N/A | Vodafone |
Installation Steps
- Check your phone supports eSIM (iPhone XS+, Pixel 3+, Samsung S20+)
- Buy eSIM via provider app (Airalo, Holafly)
- Receive QR code via email
- Phone: Settings → Cellular/Mobile → Add eSIM → Scan QR
- Label it "UK" for easy switching
- Enable data roaming on the UK eSIM only
- Disable data on home SIM to avoid roaming charges
eSIM vs Physical SIM
| Factor | eSIM | Physical SIM |
|---|---|---|
| Setup speed | 2 min | Needs shop visit |
| Best for | <30 days | 30+ days |
| Keep home number | Yes | Replaces it |
| Cost 7 days | $4.50 | £10+ |
| Cost 30 days | $10-20 | £10-20 |
| Long-term | N/A | Better (giffgaff £10/month) |
UK Networks
- EE — best coverage, fastest 5G, premium pricing
- Vodafone — wide coverage, good 5G in cities
- O2 — good coverage, "Priority" discounts/events
- Three — cheapest, excellent data speeds in cities
- giffgaff (runs on O2) — prepaid, no-contract SIM, £10 PAYG
- Tesco Mobile, Sky Mobile, VOXI — MVNOs on the above networks
📱 Long stay strategy: Order a giffgaff SIM to your hotel (free UK delivery) for longer stays. £10/month for 15GB + unlimited calls/texts. No contract, PAYG, keeps rolling.