Plan A Data-Only SIM Card
Lower-cost data-only SIM for locations where AT&T or T-Mobile has reliable signal.
AT&T and T-Mobile
View Plan A
Router data SIM
SIM Card for 4G and 5G Routers
Use a SpectrumSIM data-only SIM card in unlocked cellular routers, MiFi routers, and compatible 4G or 5G gateways for portable or backup WiFi.
Works withUnlocked 4G LTE routers, 5G routers, Cudy routers, Netgear Nighthawk hotspots, and portable WiFi routers
Best pricePlan A for lower-cost router data where AT&T or T-Mobile is reliable
Widest coveragePlan B if the router is mobile, rural, or may need Verizon coverage
Data starting pointStart with 10 GB per month for standard router use and increase for heavier browsing or backup internet
Plan recommendation
Choose the SIM by coverage at the device location.
Both options are data-only SIM cards for connected devices. The right choice depends on which carrier works best where the device will actually be used.
Plan B Triple-Network Data-Only SIM Card
Triple-network data-only SIM for rural, remote, mobile, or uncertain coverage locations.
AT&T, T-Mobile, and Verizon
View Plan B
Pricing and plans last verified: June 2026.
Buyer guidance
What to know before ordering.
For unlocked cellular routers
The router must be carrier-unlocked and compatible with US cellular bands. If the router lets you create or edit an APN profile, set the APN to puffin for most current SpectrumSIM cards.
Backup internet and remote WiFi
Routers can use more data than cameras or GPS trackers because multiple devices may connect through the WiFi network. Pick a monthly plan that matches browsing, work, video calls, and backup needs.
Setup path
Get online in four steps.
Confirm the device is unlocked and supports US 4G LTE or compatible 5G bands.
Choose Plan A for AT&T and T-Mobile or Plan B for AT&T, T-Mobile, and Verizon.
Activate online, choose a data plan, and complete payment before final setup.
Use puffin as the APN for most current SpectrumSIM cards and enable data roaming if available.
FAQ
Common questions about sim card for 4g and 5g routers.
Will SpectrumSIM work in my 4G or 5G router?
It can work if the router is unlocked, supports compatible US cellular bands, and allows the correct APN settings.
What APN should I enter for a cellular router?
Use puffin for most current SpectrumSIM cards. Enable data roaming when the router has that setting.
Which data plan is best for a router?
For standard router use, start with 10 GB per month. Choose 20 GB or more for heavier laptop use, video calls, or backup internet.
Do SpectrumSIM data-only SIM cards include voice or text?
No. SpectrumSIM cards are data-only SIM cards for internet-connected devices. They do not include voice calling or SMS text messaging.
What APN should I use?
For most current SpectrumSIM cards, use puffin as the APN. If your SIM starts with 8946080, use data641003. Save the APN profile and enable data roaming when your device has that option.
Which SIM should I choose if I am not sure about coverage?
Choose Plan B if the device will be used in a rural, remote, mobile, or weak-signal location because it adds Verizon coverage. Choose Plan A when AT&T or T-Mobile is reliable at the device location.
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