US Cellular's email.uscc.net email-to-text gateway still delivers in 2026 - but it is the last major carrier gateway standing, and it is now owned by T-Mobile, which already shut down its own gateway. If your monitoring stack, on-call rotation, or alerting scripts text through US Cellular's email gateway, this page explains where it stands, why it is at risk, and how to get ahead of a shutdown you likely will not be warned about.
Last updated: 2026-08-13
Yes - but on borrowed time. email.uscc.net (SMS) and mms.uscc.net (MMS) - US Cellular's email-to-text gateways - still deliver as of 2026, and no shutdown has been announced. The catch is ownership: T-Mobile completed its acquisition of US Cellular's wireless operations on August 1, 2025, and T-Mobile retired its own tmomail.net gateway back in December 2024. A legacy, unauthenticated gateway like this is a natural candidate to be decommissioned during network integration - usually without advance notice. SigSpan is a drop-in replacement that keeps those alerts delivering no matter what happens to the carrier gateway.
For decades, IT teams have routed text alerts by emailing 5551234567@email.uscc.net - no SMS provider, no SDK, no contract. Like every carrier gateway, US Cellular offered it as a courtesy, never as a contracted service.
US Cellular is now the last of the well-known US carrier gateways still operating. T-Mobile shut down tmomail.net in December 2024, AT&T retired txt.att.net in June 2025, and Verizon has scheduled vtext.com for March 31, 2027. The email.uscc.net gateway has outlasted them - for now.
The reason it belongs on your watchlist is who owns it. T-Mobile completed its acquisition of US Cellular's wireless operations and select spectrum on August 1, 2025. The same company that was first to kill its consumer email-to-SMS gateway now controls the US Cellular one, and it is actively integrating the two networks. There is no announced retirement date - but the pattern is not in your favor, and carrier gateways rarely come with a farewell notice.
US Cellular uses two gateway domains for the same phone number - one for plain text, one for picture and longer messages. Address an email to the 10-digit number at the matching domain and the subject and body become the text.
Plain text messages, capped at the standard SMS length. This is the address most monitoring tools and scripts use for short alerts and pages.
Address format: 5551234567@email.uscc.net
Picture messages and text that exceeds the SMS length limit. Used when an alert carries an image or a longer body than a plain SMS can hold.
Address format: 5551234567@mms.uscc.net
The advantage US Cellular gives you over the other carriers is time - the gateway is up, so you can migrate on your own schedule instead of scrambling after alerts go silent. Use it.
If you want a US Cellular email-to-text replacement - or an alternative in place before email.uscc.net is retired - there are three honest categories, each with real tradeoffs:
Maximum flexibility, but every piece is yours to build and maintain. Standing up a direct SMS API means writing the email parser, deduplication, rate limiting, on-call routing, opt-out handling, and audit logging yourself - an engineering project, not a configuration change. The right answer only if you have spare engineering capacity and unusual requirements.
Comprehensive on-call platforms with schedules, escalations, and incident timelines. They do far more than replace an SMS gateway - and you pay for all of it. If your only need is to get alert emails delivered as text messages, this is usually overkill, and the pricing reflects the much broader platform you would not be using.
A drop-in replacement that preserves your existing email-based integration pattern. The only change is pointing your alerting mechanism at your unique SigSpan email address - your monitoring tools keep sending email exactly as they do today, and SigSpan handles the parsing and text delivery. No code changes, no new integrations, and nothing else in your environment changes, which makes it the lowest-migration-cost option for teams whose only goal is to keep existing alerts flowing.
SigSpan is a drop-in replacement - your monitoring tools keep sending email, SigSpan handles the text delivery. No SDK, no code changes, no new integrations. Migrate while email.uscc.net still works, and stop worrying about when the carrier pulls the plug. Free trial, no card required.
email.uscc.net is US Cellular's email-to-text (email-to-SMS) gateway, with mms.uscc.net handling picture and longer MMS messages - carrier domains that turn an ordinary email into a text message. You address an email to number@email.uscc.net (for example 2515550123@email.uscc.net) and US Cellular delivers the body as a text to that phone. As of 2026 it still works, but US Cellular is now owned by T-Mobile, which retired its own gateway in December 2024.
Yes, as of 2026 - but treat it as living on borrowed time. US Cellular has not announced a shutdown of email.uscc.net or mms.uscc.net, and messages addressed to number@email.uscc.net still deliver. The risk is ownership: T-Mobile completed its acquisition of US Cellular's wireless operations on August 1, 2025, and T-Mobile already shut down its own tmomail.net gateway in December 2024. Given that track record and the ongoing network integration, the US Cellular gateway is a strong candidate to be retired with little or no notice. Migrate before it goes dark rather than after.
For SMS, address the email to the 10-digit number at the gateway domain - number@email.uscc.net (for example 2515550123@email.uscc.net). For picture or longer messages, use the MMS domain instead - number@mms.uscc.net. The email subject and body become the text message. No SMS provider, SDK, or contract is involved; the carrier simply relays the email to the phone as a text, for as long as the gateway stays up.
Not yet, but it is the reason to plan ahead. T-Mobile closed its acquisition of US Cellular's wireless operations and select spectrum on August 1, 2025. The email.uscc.net gateway still works as of 2026, and no retirement has been announced - but T-Mobile retired its own tmomail.net gateway in December 2024, so the parent company has already demonstrated it will shut these gateways down. As US Cellular's network is integrated into T-Mobile, the legacy gateway is exactly the kind of unauthenticated service that tends to be decommissioned.
Yes. Because the gateway could be retired at any point and the carrier does not offer a supported replacement address, the closest drop-in is an email-to-text bridge: you keep sending the same alert email, and the bridge delivers it as a text over a registered A2P sender. That preserves your existing setup - no SDK, no code changes - and it keeps delivering to US Cellular numbers regardless of what happens to email.uscc.net. Direct SMS APIs and full incident-management platforms also work, but both require more integration than repointing an email address. SigSpan is an email-to-text bridge built for exactly this migration.
If you send application-to-person SMS through a US long code, yes - A2P 10DLC registration is required by the carriers, not by the SMS provider. Your replacement provider handles the registration mechanics, but you supply brand and campaign details. Registration typically takes days to weeks, so start it before your cutover. Toll-free and short codes follow separate registration processes.
Inventory first: check your monitoring config, scripts, and any alerting equipment - temperature sensors, UPS units, generator monitoring - for addresses pointing at @email.uscc.net or @mms.uscc.net, so you have a complete list of every reference. With a bridge replacement like SigSpan, the migration is a find-and-replace of the destination address rather than a rewrite - your tools keep sending email, so you change only where the alert is addressed, not how it is generated. Validate end-to-end with low-volume test traffic before cutting over production alerts, and do it proactively rather than waiting for a shutdown you will not get advance notice of.
Shutdown dates, official sources, and migration guidance for every major US carrier gateway - T-Mobile, AT&T, Verizon, and US Cellular.
US Cellular's new owner retired its own gateway in December 2024. See what that shutdown looked like - and why it signals US Cellular's direction.
Verizon retires vtext.com and vzwpix.com on March 31, 2027. See what breaks and how to replace it before the deadline.
US Cellular has not published a shutdown notice for email.uscc.net. The “at risk” assessment on this page is based on the T-Mobile acquisition and T-Mobile's prior retirement of its own gateway, not on an announced date. We will update this page if a retirement is announced.
See an error or have a more recent source? Email admin@sigspan.com - we update this page as soon as we can verify changes.