Prepaid SIM Cards and eSIM, Explained
A prepaid SIM lets you pay for phone service first, with no contract, and an eSIM does the same job but is built into the phone and set up in software.
By Liam McCabeContributing writer.
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The short answer
A SIM is what ties a phone to a carrier account and a phone number. It comes in two forms:
- Physical SIM: a small card you slide into a tray in the phone.
- eSIM: a chip built into the phone, which you load with a carrier profile in the settings, often by scanning a QR code.
"Prepaid" is about how you pay, not about the SIM. With a prepaid plan you buy service in advance; when the credit runs out, service stops until you top up. Either kind of SIM can carry a prepaid plan.
How do prepaid SIM cards work?
- Get a SIM or eSIM from a prepaid carrier, in a store or online.
- Check that your phone fits. The phone has to be compatible with the carrier's network, and a phone that is carrier-locked may only accept that carrier's SIMs until it is unlocked.
- Activate it with the carrier, which assigns a number or moves your existing one.
- Add credit or a plan. You can pay by card online or buy a refill card in a store and enter its code.
- Top up when it runs low. Nothing renews unless you set it up.
Two things to read in a prepaid plan's terms:
- Expiry: purchased credit may have a time limit, such as a set number of days from your last top-up, after which the remaining balance is lost.
- Inactive lines: carriers may close prepaid lines that go unused for a long period, and the number goes with them. The rules differ by carrier.
What is an eSIM?
An eSIM (embedded SIM) is a chip soldered into the phone at the factory. Once a carrier profile is installed, it works the same way as a plastic SIM, with its own identity on the network. Apple describes it as an industry-standard digital SIM and says an iPhone can manage eight or more eSIMs. Phones can store many plans but typically keep one or two active at once.
On an iPhone, you can add an eSIM in several ways, depending on the carrier: during setup with the carrier's activation, by scanning a QR code, by moving it from a previous iPhone with eSIM Quick Transfer, or by converting a physical SIM. Apple lists iPhone XS, XS Max, XR and later as eSIM capable.
eSIM vs physical SIM
| Physical SIM | eSIM | |
|---|---|---|
| Form | Removable card | Chip built into the phone |
| Switching carriers | Swap the card | Add a profile in settings |
| Plans on one phone | One per SIM tray | Several stored, one or two active |
| Moving to a new phone | Move the card | Transfer in settings or ask the carrier |
| Travel | Buy a local card | Add a travel plan in settings |
One catch: if a phone was bought from a carrier with a SIM lock, it may only accept eSIMs from that carrier. Some low-cost eSIM plans are data only, with no phone number.
SIM cards and minutes on Wiki Shopping
The 85 listings in SIM cards and prepaid minutes on Wiki Shopping on October 26, 2026 split into 62 SIM cards and 23 cell phone minute cards. Tracfone has the most listings with 21, followed by SpeedTalk Mobile with 8. Browse them under cell phones and accessories.
How we count
Types and brands are read from each store listing. The counts change as listings are added or removed.