Simwood

Voice & Numbering

• SIP Trunking: Wholesale VoIP trunking that scales without replacing existing PBX infrastructure.
• Numbering & Termination: Geographically resilient UK and US numbering with seamless porting management.

Messaging

• Wholesale SMS: High-capacity SMS delivered via portal or API, with built-in fraud controls.

Fraud Intelligence

• Simwood Intelligence: API-driven fraud detection that identifies threats before they escalate.

Connectivity & IP Transit

• Connectivity: Un-contended, ultra-low-latency connections from 10Mbps to 10Gbps across the UK.
• IP Transit: Direct transit options that stabilise voice traffic and reduce reliance on the wider internet.

Simwood builds and operates its own network so that telecoms businesses never have to depend on a reseller chain. Founded in 1996 by Simon Woodhead, the company started as the world's first global gateway between the internet and mobile phones and has since grown into a group of companies spanning carrier services, hosted telephony, and broadband in both the UK and the US.

The Simwood Group includes Sipcentric Limited for hosted services, Simwood eSMS for UK carrier services, Simwood Networks as a UK ISP with code powers, and US operations through Simwood Inc and Simwood LLC. Birchills Limited serves the direct SOHO and SME market.

Simwood controls every element of its infrastructure, maintains three availability zones in the UK and two in the US, and backs wholesale voice services with an industry-first 100% SLA.