Software-based, virtualized telecom infrastructure is rapidly becoming the industry standard, leading the global telecom providers to turn off several trillion dollars in legacy equipment in the past five years. Traditional data centers and dedicated networking gear are rapidly giving way to cloud-native software in the service providers’ central offices. Carrier- and vendor-managed “cloudification” / transformation programs are in flight around the world.
1. Eliminating the physical supply chain
Every traditional SIM card needs to be produced, packaged, and sent through a distribution supply chain before being disposed of again. This process requires considerable resources and results in a significant amount of plastic waste. By contrast, eSIM and iSIM architectures eliminate this entire process. A carrier can simply provide network access to a device over-the-air in a matter of seconds. No manufacturing necessary, no packaging or landfills either. For device manufacturers, this also eliminates the need to source, assemble, and quality-test a SIM tray. The savings quickly add up when producing at scale.
2. Instant carrier switching and international travel
Physical SIMs kept costs high for international travelers intentionally. Since your home carrier roams over another operator’s network and makes a tidy profit passing the costs straight to you, only a software switch to a local carrier/network would suffice. There was no easy way to install that software though, so the physical acts of tracking down a retail outlet, buying a new SIM card, and hoping the cut-down tourist plan made a dent were unavoidable.
Software-defined provisioning, available through GSMA’s remote SIM provisioning standards, removes all these hurdles immediately. An international traveler can step foot on a new continent and before the airplane hits the gate, an OTA text message can configure the phone to connect to a local operator. The entire relationship is negotiated digitally, and the costs aren’t padded to send the lucrative revenue share back through your home operator. There might not even be a physical retail outlet as the connection was facilitated OTA with a QR code or similar. No card swap, no retail clerk, no skimmed roaming profits.
3. Better hardware: space, durability, and design
The SIM tray slot is a design risk. It’s an opening in the device chassis, and openings are bad for water and dust resistance. Ingress Protection (IP) ratings – which is how you quantify how well a device seals against liquids and particles – tend to get better whenever the tray slot goes away. You’ve seen manufacturers do this, making devices that are more or less fully sealed once the necessity of that slot goes away.
Beyond protection, the slot is a waste of internal volume that industrial designers could put to so much better use. We’re in an era where phones are horribly constrained by battery capacity and thermal considerations. Following the “just-in-time manufacturing” principle of eliminating unnecessary waste, getting rid of a component that needs a slot, a card reader, and a bunch of printed trace around the motherboard means a little spare space. Not much per unit, perhaps, but at the level of an entire device, this is a shift in thinking.
4. Closing the door on SIM-swap attacks
SIM swapping is considered one of the most successful methods by which hackers take over accounts. The attacker pretends to be the account owner and provides personal information obtained from data brokers or previous hacks to a carrier to persuade a support agent to link the account owner’s phone number to a SIM card owned by the criminal. When they get a hold of the victim’s phone number, they will be receiving SMS two-factor authentication codes for bank accounts, emails, and cryptocurrency wallets. The attacker seizes the account with the stolen phone number.
Physical SIM ownership functions because ownership is transferred by people in a carrier’s call center falling for a hacker’s ruse. Software-based SIM profiles completely change that. To modify or transfer ownership of a digital profile, one must possess the authenticated device-level credentials necessary to connect with a computer, rather than just have an employee of a support call center believe a liar. That’s a different threat model. The authentication front moves from human interactions to cryptographically secure transactions, and the hackers lose their edge.
5. On-demand privacy with virtual and temporary numbers
Conventional phone numbers are something like the closest thing to an immutable universal identity we have online. Give your number to an online retailer, a marketplace, a new app, or a local business and you’ve provided some random unscrupulous company – a data broker, a listing-harvesting game, a Facebook data-scraping operation – with a durable identifier they can sell, share, or use to track you across platforms. And data harvesting operations literally compete to outbid each other for the phone numbers companies collect at sign-up, because a phone number is one of the few identifiers that doesn’t change often and links reliably to a real person.
By using software-defined telecom, we can separate our actual identity from any particular number. We can acquire a secondary number, a temporary number, for just long enough to receive a verification code and then discard it. Instead of giving our indefinitely-valid personal mobile number to random unverifiable websites, you can use services like BEE-SMS – temporary phone numbers to receive the verification code on your behalf, in the cloud, and discard the number right after. The verification goes through, the number gets dropped, and your primary identity stays out of whatever database that service probably sells to. Voilà, digital sovereignty through deregulated telephony. You get the convenience of SMS verification without the cost, over time, of revealing your real number to bad actors.
6. IoT and fleet device management at scale
Coordinating connectivity for a vast fleet of IoT devices – smart meters, shipping trackers, environmental sensors, connected vehicles – is operationally painful using the physical SIM model. Somebody must physically slot a card into every device, and when a carrier contract changes or a network underperforms in a certain region, somebody has to physically swap those cards out. For a deployment of thousands of units spread across geography, that’s not a realistic model.
Software-Defined SIM management clicks it over with a central dashboard. An ops team can reassign network profiles, switch carriers, or update connectivity parameters across thousands of devices at once without leaving the office. If a carrier’s signal degrades in a specific zone, the fleet adjusts automatically or on command. The SIM profile is software – it updates like software.
This is why enterprises that are embracing Software-Defined Networking (SDN) frameworks are increasingly treating SIM profiles as just another configurable network resource rather than a physical constraint.
7. Multi-profile and dual-connectivity capabilities
Physical dual-SIM phones necessitate two physical slots which means two trays, two openings in the chassis, and compromises in both the structural integrity and component layout of the device. With software-defined SIM profiles, you can run multiple active connections from a single chip.
A device running eSIM or iSIM can, for example, maintain a work profile and a personal profile simultaneously, switching between them transparently or running both in active standby. There’s no physical separation to manage, no second device to carry, and no fumbling with two phones in a meeting. The separation is logical rather than physical, and it’s managed through software that lets you set rules about which line handles which type of traffic.
For travelers, this extends further – you can keep your home number active for calls while running a local data profile, without any hardware change at all.
8. Programmatic control for developers and businesses
For any company that is currently verifying its customers via SMS, or using SMS for communications, or doing voice call routing, you’re dealing with a hardware dependency. You are either going through a carrier relationship that takes 6 to 9 months to get approved and set up, or you are going to cobble together a series of appliances and hope that they scale.
Telephony in the cloud via an API changes that. One developer can provision a phone number, set up some routing logic, and start receiving or sending SMS messages in a couple of lines of code. A company can automate their entire communications stack – verification, notification, support routing – without having to secure, own, or manage a single piece of telecom hardware. The number is a cloud-hosted resource with an associated API, not something you put in a colo or lights out room.
The number of active eSIMs installed in devices globally was projected to grow from approximately 1.2 billion in 2021 to over 3.4 billion by 2025, representing an increase of 180% (Juniper Research). That will give us the device and infrastructure density to make hosting things like numbers in the cloud commercially viable for almost everyone.
9. Bypassing geographic restrictions on communication access
A physical SIM locks you to a specific carrier, and further, to the regulatory and geographic limitations that carrier must respect. If you’re working or residing in a region where communications apps are blocked in response to local regulations, your options are severely limited based on what is already in your pocket. There’s no way to add an app you don’t have access to.
Software-defined routing abstracts the number from reality. A digital number issued in one country can receive SMS traffic while the token owner is based somewhere else altogether. This is how journalists, remote workers, digital nomads, and the privacy-concerned maintain consistent communications access. The number is in the cloud. It’s not tied to a physical machine on a tower, or to a carrier who answered an RFP and built it that tower, or to a regulatory jurisdiction that mandated app-blocking on that physical SIM in that phone in your pocket.
10. The convergence of telecom and unified cloud communications
All of this will not only make physical SIMs disappear but also turn phone numbers into cloud software possessions. Unified Communications as a Service (UCaaS) systems are currently blurring the distinction between a conventional cell number and a cloud-based communication endpoint. Call routing, voicemail, SMS, video, and messaging can all be linked to a single cloud-managed identity that is not related to a chip existing in any device.
When a phone number is linked to a cloud resource, it will act accordingly. It can be versioned, replicated, transferred, and managed through software policy rather than physical hardware. A company can reassign its departing employee’s number to the replacement in just seconds, without accessing any hardware. An individual can even transfer their number between platforms similar to when they transfer a domain name between registrars.
This is the main change: telecommunications infrastructure will no longer be something you physically own, but something that you set up, manage, and govern through software.
Physical SIM cards won’t vanish overnight – legacy hardware cycles are slow and carrier infrastructure takes time to update. But the direction is set. Every new capability that software-defined telecom unlocks – better privacy, stronger security, operational flexibility, hardware improvements – comes at the direct expense of the physical card’s remaining relevance. The replacement isn’t coming. It’s happening.
