Credit: Joe Maring / Android AuthorityTL;DRT-Mobile is quietly offering an unadvertised “Super Essentials Saver” plan for $25 per month with AutoPay ($30 without AutoPay) for up to two lines.The plan is an in-store exclusive available only at physical Walmart locations and is restricted to new T-Mobile accounts.Plan benefits include unlimited talk, text, 5G data (50GB premium data before throttling), unlimited 3G mobile hotspot, international texting, roaming in Canada and Mexico, and access to T-Mobile Tuesdays.T-Mobile appears to be quietly offering a super-cheap postpaid unlimited plan that significantly undercuts its standard pricing, but you won’t find it listed on the carrier’s storefronts. Dubbed “Super Essentials Saver,” the new plan costs just $25 per month with AutoPay (or $30 without it) for unlimited talk, text, and 5G data. That comes at a steep discount compared to the carrier’s Essentials Saver and Experience plans, which start at $50 per month for a single line.As initially spotted by users on Reddit (via PhoneArena), the Super Essentials Saver plan is an in-store exclusive available only through physical Walmart locations. It is not advertised on T-Mobile’s website or online channels. Crucially, the offer is restricted to new T-Mobile accounts, meaning existing subscribers looking to lower their monthly bill won’t be able to switch over directly. The promotional price is also limited to up to two lines.