Red alert: You should block these 10 spam numbers immediately!
In July 2025, spam calls increased by 23%. Consumers should heed warnings and report unauthorized calls.

Red alert: You should block these 10 spam numbers immediately!
The increase in unwanted spam calls is not only causing excitement in Cologne, but also shows a worrying pattern across the entire Federal Republic. Loud Mercury the number of these calls increased by almost 23% in July 2025 compared to the previous month. This leaves no doubt that consumers need to be vigilant.
Fraudsters are often particularly bold in posing as consumer advocates or using fictitious competitions to lure unsuspecting citizens into the money trap. The scams are diverse: from dubious subscription traps to dubious offers that are not in reality. Nine out of ten of these spam numbers even come from Germany, which doesn't make the matter any less alarming.
The most common spam numbers at a glance
To warn readers, we have put together a list of the ten most common spam numbers:
| rank | number | Location | Type of advertising |
|---|---|---|---|
| 1 | 0211 95586812 | Dusseldorf | Cost trap competition |
| 2 | 040 855983157 | Hamburg | Cost trap competition |
| 3 | 0211 95586831 | Dusseldorf | Cost trap consumer protection |
| 4 | 1634564718 | Mobile Germany | Cost trap competition |
| 5 | 040 855983158 | Hamburg | Cost trap competition |
| 6 | 0211 95586811 | Dusseldorf | Cost trap consumer protection |
| 7 | 040 29996653 | Hamburg | Sales insurance |
| 8 | +31 6 23998055 | Mobile Netherlands | Cost trap competition |
| 9 | 0163 4563643 | Mobile Germany | Cost trap competition |
| 10 | 0157 53802672 | Mobile Germany | Cost trap competition |
Consumers must take action
Consumers should be aware that commercial calls are prohibited by law without prior consent. The Consumer advice center points out that companies face severe fines for unsolicited calls. We are therefore advised not to engage in such harassment and to always report unauthorized telephone advertising to the relevant authorities. If an undesirable contract is concluded, the following applies: Contracts can usually be revoked within 14 days.
But how do you best protect yourself? First of all, it is advisable to block telephone numbers of dubious callers or have them blocked by the telephone provider. In addition, basic information about calls should be noted so that they can be reported if the worst comes to the worst. The Lawyer Page provides information on how to report spam calls to the Federal Network Agency, where detailed information is required in order to effectively prevent the harassment.
In times of increasing spam calls, it is important to be vigilant and not be blinded by supposed offers. When in doubt, always keep calm! If you are not sure, you should hang up and block the number.