IoT SIM card for the USA: multi-carrier roaming on AT&T, T-Mobile and Verizon
Multi-carrier IoT SIM card with data roaming across the major US networks: AT&T, T-Mobile and Verizon. The SIM switches automatically to the strongest available signal, with no manual reconfiguration. Built for the US after the 2G/3G sunset (4G LTE, LTE-M, NB-IoT, Cat-1 bis), with API management, private APN and an eSIM eUICC route for long-lived deployments.
Why iot.cards for IoT deployments in the USA
Multi-carrier across the three major US networks
The SIM connects via data roaming agreements to AT&T, T-Mobile and Verizon. If one network loses signal in a specific area, it switches automatically to the strongest available one with no manual reconfiguration. A single SIM covers deployments spread across states without negotiating with each carrier.
Permanent roaming: the honest answer
There is no explicit federal ban on permanent roaming in the US, but US carriers commercially monitor foreign SIMs in permanent use and can steer them off the network after a few weeks. Our answer is twofold: multi-carrier failover (if one network steers the SIM out, it re-attaches to another) and, for long-lived large fleets, an eSIM eUICC route that downloads a local profile.
Ready for the US after the 2G/3G sunset
US 2G/3G networks have been fully shut down since 2022. Your device must support 4G LTE, LTE-M, NB-IoT or Cat-1/Cat-1 bis. The key LTE bands (B2, B4, B12, B13, B71) vary per carrier: we validate your module's band support during onboarding.
Private APN and static IP
Dedicated APN with an IPSec or WireGuard tunnel into your VPC, also for SIMs deployed in the US. Your devices send data without traversing the public Internet. Static IP available as an add-on for inbound access to routers and cameras.
Unified management via portal and API
A single portal and REST API for the whole deployment: bulk SIM provisioning, usage alerts and HMAC-signed webhooks. The same panel manages SIMs in the US, Europe or any other country, with no separate tools per carrier.
Engineering support in English and Spanish
Engineering team in Seville, Spain. Support in English and Spanish during CET hours; 24/7 with SLA on enterprise plans. During onboarding we advise on LTE bands, device certification and APN configuration for the US.
IoT coverage in the United States
The SIM roams on the major US networks and registers automatically on the one with the best signal at each location. Beyond the US, the same SIM works on 750+ networks across 190+ countries: useful for assets moving between the US, Canada and Mexico without changing SIM or platform.
Carriers in the United States
- AT&T
- T-Mobile US
- Verizon (data roaming)
Available technologies
The US 2G/3G sunset is complete: AT&T shut down 3G in February 2022, Verizon its CDMA/3G in December 2022 and T-Mobile its 3G/2G networks over the course of 2022. Devices must support 4G LTE, LTE-M, NB-IoT or Cat-1 bis, and it pays to validate the module's LTE bands (B2, B4, B12, B13, B71 depending on carrier) before manufacturing or deploying.
Capabilities for US deployments
Beyond basic connectivity, the IoT SIM ships with the layers a US deployment needs:
Private APN over US networks
Dedicated APN with your CIDR range and an IPSec or WireGuard tunnel into your VPC. Your devices in the US send telemetry directly to your platform without traversing the public Internet.
View private APNeSIM eUICC with local profile
For large, long-lived US deployments, the eSIM eUICC (SGP.02/SGP.32) downloads a local profile over the air without touching the device. It is the route that removes the permanent-roaming dependency at the root.
View IoT eSIMREST API for bulk management
Activation, pause, plan changes and consumption queries by API. Batches via CSV, usage alerts and HMAC-signed webhooks. Manage US SIMs and the rest of the world from the same integration.
API documentationPooled data across devices
Shared data pool across all SIMs in the deployment: high-usage devices compensate the ones that barely transmit. Sized to the aggregate profile of your device fleet.
View pooled plansTypical use cases in the United States
- Logistics and asset tracking across states
- Fleet telematics and road transport
- EV charging networks
- Smart agriculture in the Midwest
- Cold chain and refrigerated transport
- Industrial and machinery monitoring
- Smart city and street lighting pilots
- POS and payment terminals
- Solar plant monitoring
- Dashcams and video telematics
Pricing and lock-in
No lock-in, billed in euros. Three tariffs depending on the consumption profile:
Pay-as-you-go (low usage)
From €0.005/MB per SIM. For sensors, trackers and light telemetry transmitting a few MB per month.
High usage
From €1.50/GB. For routers, dashcams and devices moving gigabytes: cameras, digital signage, cellular backup.
Enterprise
Custom tariff with SLA, dedicated private APN and 24/7 support. For large device fleets in the US or multi-country deployments.
Full detail at /pricing/pay-as-you-go and /pricing/shared-data. The SIM Test Kit (5 SIMs, 1 GB over 12 months, €15 VAT included) ships free to Spain and for €15 to the rest of EU+UK. The kit ships within Europe only: the usual flow is to validate it at your European office or lab and then deploy the SIMs in the US.
Frequently asked questions about IoT SIMs in the USA
- Does the SIM work on Verizon, AT&T and T-Mobile?
- Yes. The SIM has data roaming agreements with the three major US networks: AT&T, T-Mobile and Verizon. It registers automatically on the one with the strongest signal at each location and switches between them with no manual reconfiguration. You don't need separate contracts with each carrier.
- Is permanent roaming allowed in the United States?
- There is no explicit federal ban, but US carriers commercially monitor foreign SIMs in permanent use and can steer them off the network after a few weeks. Our answer is multi-carrier failover: if one network steers the SIM out, it re-attaches to another available one. For long-lived large fleets we also recommend the eSIM eUICC route with a local profile (/products/iot-esim). We analyze the mechanism in detail in /resources/blog/roaming-permanente.
- Which technologies does my device need after the 2G/3G sunset?
- US 2G/3G networks have been fully shut down since 2022 (AT&T 3G in February, Verizon CDMA/3G in December, T-Mobile over the course of the year). Devices must support 4G LTE, LTE-M, NB-IoT or Cat-1/Cat-1 bis. On top of that, the key LTE bands (B2, B4, B12, B13, B71) vary per carrier: validate that your module supports them before manufacturing.
- Does my device need PTCRB or carrier certification?
- It may. Some modules and devices require PTCRB or carrier certification to connect to US networks. That is a device-side responsibility of the manufacturer (OEM), not of the SIM, but we advise during onboarding on what applies to your specific hardware.
- How do I test the SIM before deploying in the US?
- The SIM Test Kit (5 SIMs, 1 GB over 12 months, €15 VAT included) ships within Europe only: free to Spain and for €15 to the rest of EU+UK. The usual flow is to receive the kit at your European office or lab, validate the device there and then deploy the SIMs in the US. Roaming works the same on both sides.
- How is pricing structured?
- Pay-as-you-go from €0.005/MB for low usage and from €1.50/GB for high usage, plus a monthly fee per SIM depending on the plan. No lock-in and billing in euros. Detail at /pricing/pay-as-you-go and /pricing/shared-data.
- Are static IP and private APN available in the United States?
- Yes. The private APN with an IPSec or WireGuard tunnel is also available for SIMs deployed in the US (detail at /iot-sim-private-apn), and static IP is contracted as an add-on (/iot-sim-static-ip). It's the standard architecture for routers and cameras that need inbound access.
- How do I manage hundreds of US SIMs at scale?
- Via the unified portal and the REST API: bulk provisioning by CSV, tags per device or project, usage alerts and HMAC-signed webhooks to integrate events into your system. Documentation at /platform/api. The same credentials manage SIMs in the US and any other country.
- Does it cover US-Canada-Mexico corridors?
- Yes. The same SIM works in 190+ countries and 750+ networks, including Canada and Mexico, with no re-provisioning when crossing the border. It's the typical setup for logistics and asset tracking on North American corridors. Full map at /coverage.
- Which currency am I billed in?
- In euros. iot.cards is an operator based in Spain (Kore Logic SL) and all invoicing is issued in EUR, also for SIMs deployed in the US. If you work with dollar budgets, factor it in when sizing: the per-MB or per-GB rate is fixed in euros.
Request trial SIMs for your US deployment
We ship the SIM Test Kit (5 SIMs, 1 GB over 12 months, €15 VAT included, free shipping to Spain and €15 to the rest of EU+UK) so you can validate the device at your European office or lab before deploying in the US, or schedule a technical call to review bands, certification and pricing for your case.