Effective Date: 2026 | Sigma Phone LLC
We provide new accounts with an evaluation trial period to test delivery performance, API integrations, and feature sets risk-free prior to committing to a paid tier.
Subscriptions renew automatically on a monthly or annual billing cycle. You may cancel your subscription at any time via your account settings. Upon cancellation, your account remains active until the end of the current billing cycle.
Sigma Phone LLC offers refunds under the following specific circumstances:
Refunds will NOT be granted for accounts suspended due to violations of our Anti-Spam Policy, high bounce rates, unsolicited bulk emailing, or domain reputation degradation caused by user emailing behavior.
To request a refund review, contact our corporate support at:
Sigma Phone LLC
1209 MOUNTAIN ROAD PL NE, STE R, ALBUQUERQUE, NM 87110
Phone: +1 4783705083