Choosing a SIM contract in Germany can be confusing because data limits, network coverage, prices, contract periods and special bonuses vary widely. CHECK24 lets you compare multiple offers in one place and filter them according to your needs.
This guide explains how to compare SIM-only contracts and avoid paying for features you do not need.
Affiliate disclosure: This article contains a referral link. If you take out a contract through this link, I may receive a voucher or commission. This does not increase the price you pay.
Start with Your Actual Mobile Data Usage
Before comparing contracts, check how much mobile data you normally use each month. You can find this information in your phone settings or in your current provider’s app.
As a simple guide:
- 3–5 GB: messaging, email, maps, and occasional browsing;
- 10–15 GB: regular social media, music, and everyday use;
- 20–30 GB: frequent video streaming and video calls;
- 50 GB or more: heavy streaming or regular hotspot use.
Do not automatically choose an unlimited plan. A smaller package is often much cheaper if you mainly use Wi-Fi at home and at work.
Open the CHECK24 SIM Comparison
Use my recommendation link to open the CHECK24 mobile tariff comparison:
Compare SIM contracts on CHECK24 – click here
The link takes you to the comparison page. Enter your preferred data allowance and use the filters to narrow down the offers.
Choose the Right Mobile Network
Germany has four network operators: Telekom, Vodafone, Telefónica/o2, and 1&1. Many smaller mobile brands use one of these networks.
The cheapest contract is not useful if the signal is poor where you live or work. Check the network coverage maps for your home, workplace, and regular travel routes before choosing a tariff.
If possible, also ask neighbours or colleagues which network works well locally.
Set the Most Important Filters
On CHECK24, filter the results according to what you really need:
- monthly data volume;
- preferred network;
- 4G or 5G access;
- maximum download speed;
- monthly cancellable or fixed-term contract;
- physical SIM or eSIM;
- number portability;
- maximum effective monthly price.
If your phone supports eSIM, you can filter for compatible offers. An eSIM is activated digitally, but not every tariff or device supports it.
Compare the Effective Monthly Price
Do not look only at the advertised monthly fee. Compare the effective monthly price, which may include:
- the basic monthly fee;
- an activation or connection fee;
- shipping costs;
- temporary discounts;
- cashback;
- provider credits or vouchers.
A contract advertised for €9.99 per month may cost more after the promotional period. Open the tariff details and check the full cost over the minimum contract term.
Check the Contract Period
A 24-month contract can offer a lower effective price, but it limits your flexibility. A monthly cancellable contract may be better if you are new to Germany, plan to move, or are unsure about the network.
In the CHECK24 results, look for the minimum contract period and what happens after it ends.
Do not confuse monthly cancellable from the beginning with monthly cancellable only after the minimum term.
Read the Speed and Data Conditions
Two tariffs with the same data volume may have very different maximum speeds. Check:
- whether 5G is included;
- the maximum download and upload speed;
- what happens after you use all your data;
- whether extra data is added automatically for a fee;
- whether EU roaming is included.
Most people do not need the highest possible speed for messaging, maps, music, and normal video streaming. Reliable local coverage is usually more important than an impressive maximum speed.
Keep Your Current Phone Number
If you want to keep your German mobile number, select Rufnummernmitnahme during the order process. CHECK24 lets you check whether number portability is available for the chosen offer.
Enter your current provider and personal details exactly as they appear in your existing contract. Different names, addresses, or dates of birth can delay the transfer.
Do not cancel the old contract too early. First follow the instructions shown during the order process.
Check Cashback and Voucher Conditions
Some CHECK24 offers include cashback, vouchers, or provider credits. These benefits may have different requirements.
Before ordering, check:
- who pays the bonus;
- whether you must upload your first invoice;
- the deadline for claiming cashback;
- when the payment or voucher will arrive;
- whether the bonus is already included in the effective price.
Save the order confirmation and take a screenshot of the offer. Add any cashback deadline to your calendar so that you do not lose the bonus.
Review the Tariff Details Before Ordering
Before entering your payment details, read the complete tariff summary. Confirm:
- the provider and network;
- the monthly data allowance;
- the maximum speed;
- the minimum contract period;
- the normal price after any promotional period;
- activation and shipping fees;
- eSIM or physical SIM availability;
- number portability details;
- cashback requirements;
- cancellation conditions.
You will normally need a German address, identification details, and a bank account for direct debit. The provider may also perform a credit check.
Quick Checklist
Before taking out a SIM contract through CHECK24:
- check your real monthly data usage;
- verify network coverage where you spend most of your time;
- compare the effective price, not only the monthly fee;
- decide whether flexibility or a lower long-term price matters more;
- check speed, 5G, eSIM, and EU roaming conditions;
- enter your details correctly for number portability;
- read the cashback or voucher instructions;
- save all confirmations and important deadlines.
Final Tip
The best SIM contract is not always the cheapest one. Choose the offer that gives you reliable coverage, enough data, and a contract period that fits your plans.
Ready to compare?
Use CHECK24 link to find a suitable SIM contract.
If you complete a contract through this link, I may receive a voucher or commission at no extra cost to you. Thank you for supporting LeeLink.