MultiSIM (also called NumberShare or multi-device SIM) allows a single phone number and data plan to be shared across multiple devices — enabling employees to take calls and messages on their tablet, smartwatch, or laptop using the same number as their primary phone, without managing separate plans for each device.
Executives and mobile professionals increasingly work across multiple devices — answering calls on a tablet in a meeting room, checking messages on a smartwatch during a commute, and using a laptop cellular connection when traveling. MultiSIM eliminates the friction of managing separate devices and numbers, creating a seamless multi-device experience from a single carrier plan. RLM advises on MultiSIM strategy and carrier program evaluation.
A structured advisory process — from environment assessment and carrier/vendor evaluation to deployment support and ongoing optimization.
We document the multi-device use cases across your organization — identifying the employee roles that would benefit from MultiSIM, the device combinations in use, and the communication workflow gaps that MultiSIM addresses.
We evaluate MultiSIM programs across AT&T NumberSync, Verizon NumberShare, and T-Mobile DIGITS — comparing included device limits, monthly fees per additional device, and the device compatibility that determines program viability.
We design the MDM approach for MultiSIM deployments — ensuring secondary devices are enrolled and managed equivalently to primary devices, with appropriate security policies and the remote wipe capability for lost secondary devices.
We model the cost of MultiSIM programs against the productivity value of multi-device connectivity — comparing carrier program fees against the alternative of separate plans for each device type.
The dimensions that separate high-performing mobility deployments from costly ones — and the questions RLM helps you answer before any commitment.
MultiSIM programs charge per additional device per month. Evaluate the fee structure against actual multi-device adoption — programs that sound compelling can become expensive when adopted broadly.
Smartwatch calling over MultiSIM works well for short interactions but has limitations for extended calls. Evaluate the use case fit before standardizing smartwatch calling as a primary communication channel.
MultiSIM functionality often doesn't extend to international roaming — the secondary devices may not be reachable when traveling. Evaluate international limitations for mobile employee use cases.
MultiSIM handles calls and SMS, but business messaging apps (Teams, Slack) may not synchronize notifications across devices without separate configuration. Evaluate the full communication experience across all intended devices.
Secondary devices may have weaker physical security than primary phones — tablets left in conference rooms, smartwatches accessible without PIN. Evaluate the security posture of secondary devices before enabling access to business communications.
"RLM helped us rationalize our mobile fleet across four carriers and cut our monthly spend by 31%. They handled the whole transition — we didn't lose a single device."
"We needed private LTE across 12 distribution centers. RLM mapped the vendors, ran the RFP, and had us live in 90 days. Their knowledge of the carrier landscape is unmatched."
Talk to an RLM advisor who specializes in enterprise mobility. Vendor-neutral guidance from assessment through deployment.