Billericay mobile coverage Three 100% indoors here, 83% across Chelmsford CM4 · Basildon
No network wins CM4 on overall coverage: all four score 100/100.
CM4: Billericay, Margaretting, Mountnessing, West Hanningfield, Stock, Roxwell, Highwood, Fryerning (Basildon, Brentwood, Chelmsford).
CM4 scores
Ofcom Mobile Coverage data (May 2025), measured across 88 addresses in 6 sampled postcodes: CM4 0AA, CM4 0BD, CM4 0DL, CM4 0GH, CM4 9DS, CM4 9EP. Methodology.
How CM4 compares
Against the Chelmsford average
- Three indoors: 100% here, 83% across Chelmsford (+17).
Weakest spot in Chelmsford: CM9 Maldon, where Three reaches 50% indoors.
Indoor signal around CM4
| District | km away | EE | O2 | Three | Vodafone |
|---|---|---|---|---|---|
| CM4 Billericay (here) | – | 100% | 100% | 100% | 100% |
| CM2 Great Baddow, Sandon | 8 | 100% | 100% | 100% | 100% |
| CM1 Writtle, Broomfield | 9 | 100% | 100% | 100% | 100% |
| CM5 Ongar, Fyfield | 11 | 100% | 96% | 80% | 96% |
| CM3 Hanningfield, Sandon | 14 | 100% | 96% | 100% | 63% |
| Chelmsford average | – | 97% | 98% | 83% | 93% |
Biggest difference nearby: Three indoors, 100% here and 80% in CM5 Ongar, 11 km away.
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1pMobile runs on EE's network: £5 a month for 5GB (read 19 October 2026). A price, not a coverage ranking: Ofcom separates no network here.
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