Sources: DOJ has sent subpoenas to the top 4 US mobile carriers and GSMA association over alleged collusion to impede eSIM features for easier carrier switching
AT&T, Verizon at center of probe into whether major carriers are making it harder for subscribers to switch providers
Context & Ripple Effects
This subpoena lands mid-arc in Washington's escalating scrutiny of wireless switching friction: the DOJ is probing whether AT&T, Verizon, and their peers worked through the GSMA standards body to slow eSIM adoption precisely because eSIM removes the physical-SIM excuse for blocking a switch. The same agency was simultaneously squeezing the market structure itself, reportedly demanding concessions in T-Mobile–Sprint merger talks to preserve a fourth national carrier.
The probe's afterlife matters as much as its launch: the DOJ ultimately closed the investigation without charges in late 2019, but the conduct it flagged kept resurfacing — most recently in a 2025 escalation where AT&T blocked T-Mobile's Easy Switch tool twice as carrier rivalry turned into explicit poaching wars.
First-order effects
- AT&T, Verizon, T-Mobile, Sprint, and the GSMA must respond to federal antitrust subpoenas, putting internal standards-body deliberations and eSIM rollout decisions under legal discovery.
- Any carrier found impeding eSIM-based switching faces immediate exposure on the exact feature that lets customers change providers without a store visit.
Second-order effects
- With the DOJ pressing both this probe and merger conditions, carriers' switching-related practices become a pricing and marketing battleground — a dynamic that later flared into lawsuits over tools like T-Mobile's Easy Switch being blocked by AT&T.
- Device makers and MVNOs gain leverage: if eSIM friction is treated as collusion rather than network management, the cost of locking subscribers in rises across the industry.
Third-order effects
- The DOJ's theory here — that coordinated friction against switching is an antitrust violation — resurfaces years later when it sues Apple over barriers to leaving the iPhone ecosystem, suggesting a durable enforcement template aimed at lock-in wherever it lives, SIM tray or software.
- If regulators keep treating switchability as a protected consumer right, carrier and platform business models built on exit costs face structural erosion, pushing competition onto price and service rather than captivity.
The trend: US antitrust enforcement is converging on customer lock-in as a core violation — from carrier eSIM collusion to device-ecosystem walls — making switching friction the recurring test case.