Best SIM Card in Germany for Students (2026): Networks, Prepaid Plans and the ID Rule Nobody Warns You About

Getting a German phone number is one of the first things you need — for the Anmeldung appointment, the bank, the health insurer, the landlord — and it is slightly harder than in most countries for one reason: German law requires every SIM card to be registered to an identified person before it can be activated. You cannot buy one at the airport and start calling. Plan for it, and it takes an hour; don't, and you spend your first days offline.

The three networks

Every SIM in Germany runs on one of three physical networks, whatever brand is printed on the packaging.

For a student living in a city and mostly using the phone there, O2-based prepaid is the value choice. If you will commute by regional train, live in a smaller town or travel around Germany a lot, the Telekom network is worth the extra few euros, and congstar or fraenk get you onto it far cheaper than a Telekom contract.

Prepaid vs contract

Take prepaid (Prepaid-Tarif) for at least your first months. It needs no German bank account, no credit history and no notice period, all of which you will lack on arrival. Plans renew every four weeks and you can switch or stop at any time.

A contract (Vertrag, typically 24 months) only makes sense once you are settled, have a German bank account, and know you are staying. Contract prices are not dramatically better any more, and the two-year lock-in with a three-month notice period is a trap for anyone who might leave after a semester.

What a reasonable student plan costs

Prices move, but as a benchmark in 2026:

• €8 – €12 per four weeks buys roughly 10–20 GB of data with unlimited calls and texts within Germany on an O2- or Vodafone-based prepaid brand.
• €10 – €15 gets similar data on the Telekom network via congstar or fraenk.
• €15 – €20 reaches 30 GB and up, or the flagship brands' own prepaid tiers.

Discount supermarket brands — Aldi Talk (O2), Lidl Connect (Vodafone) — are genuinely good and are sold at the till of every Aldi and Lidl in the country. Ethnic-focused brands like Lebara and Lycamobile (both O2) bundle cheap international minutes, which matters if you call home a lot.

All plans include EU roaming at no extra cost, so your German SIM works on a trip to France or Poland just as it does at home.

The ID rule, and how to get past it in an hour

Since 2017 every SIM sold in Germany must be linked to a verified identity before activation. Three ways to do it:

In a shop. Buy at a network store, an electronics chain, or a supermarket that offers on-the-spot activation. Show your passport, they verify you, done. The most reliable route on day one.

Video-Ident. Buy the SIM anywhere, then verify online via a video call where an agent checks your passport on camera. Works well, needs a stable connection — use hotel or university Wi-Fi.

Post-Ident. Take the SIM and your passport to a Deutsche Post branch, where a clerk verifies you. Slower but foolproof.

Bring the passport, not a national ID card from outside the EU — most systems only accept an EU ID card or a passport. Your visa or residence permit is not needed for the SIM itself.

eSIM

Most brands now sell eSIM as well as physical cards, and for an unlocked recent iPhone or Android it is the fastest option: order online, verify by Video-Ident, scan a QR code, connected. Check two things first — that your phone is unlocked (carrier-locked phones from some countries will not work on any German SIM), and that it supports the LTE/5G bands used in Germany, which nearly all phones sold in the last five years do.

Practical sequence for arrival week

Before you fly: make sure your phone is unlocked. If you have an eSIM-capable phone, you can even order a German eSIM in advance and activate it on landing.

Day one: buy a prepaid SIM where activation is done in the shop, with your passport. Aldi, Lidl, a Telekom or O2 store, or MediaMarkt/Saturn all work.

Week one: this German number goes on every form — Anmeldung, bank, health insurance, university portal. Choose a plan you will keep for a while so the number stays stable.

Month three: once you have a bank account and a routine, review. Switching brands is painless; switching numbers is not, so port the number if you move (Rufnummernmitnahme, free by law).

The mistakes that cost money

• Buying a contract at the airport kiosk. Convenient, expensive, and you are locked in for two years before you know where you will live.
• Letting prepaid credit expire. Most prepaid SIMs deactivate after a long period without top-up. If you go home for the summer, top up once before you leave.
• Assuming coverage from the brand name. A €7 plan on O2 is superb in Berlin and nearly useless in parts of the Black Forest. Match the network to where you will actually be.
• Ignoring the number on official letters. German offices communicate by post, not by phone — read every letter that arrives. If one from a Behörde is hard to understand, Amtsbrief photographs the letter and explains in plain language what it means and whether you need to act.

Once the phone works, the rest of arrival week is Anmeldung, bank and insurance — we have guides for registering your address, opening a bank account and student health insurance.