The phone vibrates, you look at the screen and a number starting with 900906645 appears. The first reaction is usually the same for everyone: frowning, hesitating between picking up or letting it ring, and finally resorting to Google to see what story lies behind those nine digits. If you've come this far, it's likely you're in that intermediate phase between curiosity and annoyance.
Let's get to the point: this number has become one of the most discussed on forums and call identification websites in Spain, and not for pleasant reasons. User reports point in a very clear direction, although it is worth clarifying quite a bit before slapping the label of "SPAM" without further ado.
Who is behind 900906645?
The first thing to understand is the 900 prefix. In Spain, numbers starting with 900 are free lines for the person receiving the call, yes, but also for the caller. That is to say, picking up will not cost you a penny. That's the good news. The bad news is that 900 prefixes are frequently used by customer service companies, commercial departments, and, above all, call centers contracted by third parties for mass campaigns.
According to comments collected on platforms like ListaSpam, Responderono, or Tellows, 900906645 is predominantly associated with commercial calls from the energy sector. Users describe a fairly repetitive pattern: someone on the other end of the phone, usually in a hurry, asks about your electricity or gas bill, tells you they have detected that you are paying too much, and offers you a "free review" of your rate. Up to this point, nothing we haven't heard a thousand times.
The typical call pattern
If you pick up, the conversation usually follows a fairly recognizable script:
- They greet you by name (yes, they have your data, and that is already concerning).
- They mention your current company or claim to be "reviewing contracts in your area".
- They offer you savings that sound too good to be true.
- They insist that they need to confirm "a few quick details" to send you the offer by email.
The problem is not that they call you to sell you something; that is legitimate as long as they comply with the regulations. The problem is the insistence bordering on obsessive, the lack of clarity about which company they actually represent, and, in some cases, practices that dangerously verge on changing your company without explicit consent, which in the industry is known as slamming.
Is it really SPAM or is it a legitimate call?
Here we need to get technical, because the difference matters. Phone SPAM is not just any commercial call that annoys you; it is one that is made without your prior consent or in violation of data protection and telecommunications regulations.
Since the entry into force of the General Telecommunications Law amended in 2023, unsolicited commercial calls are prohibited by default. This means that, unless you have given your express authorization to a specific company (by signing a contract, subscribing to a service, or accepting commercial communications on a website), they should not be able to call you to sell you anything.
And this is where 900906645 enters murky territory. Many users claim to never have given their consent to the company calling them from that number, which, if confirmed, would constitute a sanctionable infringement by the Spanish Data Protection Agency (AEPD).
Signs that indicate a problematic call
There are several signs that should raise alarms:
- They do not clearly identify the company from which they are calling, or use generic names like "Customer Service Department" without specifying which company.
- If you ask where they got your number, they change the subject or give vague answers like "from a public database" (spoiler: your number is not public).
- They pressure you to make quick decisions or to provide bank details "just to verify".
- If you ask to be removed from their lists, they call you back the following week.
If you recognize any of these points, you already know that the call is not exactly a model of good commercial practices.
How to act if 900906645 calls you
First, stay calm. Receiving a call from this number does not imply any immediate risk. It is not a banking fraud, they will not empty your account just for picking up, and technically, you are not obliged to answer or listen to what they say. That said, there are some things you should do.
If you decide to pick up, be direct. Ask for the full name of the salesperson, the exact name of the company they represent, and demand to know where they obtained your data. You have the right to that information under the Organic Law on Data Protection (LOPD), and any serious company will provide it without drama. If they refuse or evade the question, you already have your answer.
Explicitly request the cessation of calls and the deletion of your data. This request is recorded, and if they call you again, you have ammunition to report them.
Sign up for the Robinson List. It is a free service managed by the Spanish Association of Digital Economy that allows you to oppose receiving advertising by phone, SMS, postal mail, or email. It is not infallible (companies that already have your prior consent can still contact you), but it drastically reduces the volume of commercial calls.
Block the number on your mobile. Both Android and iOS allow you to do this in two taps, and apps like Truecaller or Hiya automatically identify and filter this type of call.
What if I want to report it?
If you believe your privacy has been violated, you can file a complaint with the AEPD through their electronic headquarters. The process is free, done online, and you do not need a lawyer. However, it is advisable to provide evidence: date and time of the calls, screenshots of the log, and, if you have recorded the conversation (it is legal if you participate in it), even better.
Real opinions from those who have received it
The reviews circulating online are quite unanimous. Most agree in labelling it as a annoying commercial call and, in many cases, as pure and simple spam. Some have even received up to three calls in a single day from this number, which is no longer commercial; it is undercover harassment.
Interestingly, there are also positive comments, mainly from people who eventually contracted some offer and were satisfied with the change. This shows that not everything is black and white: behind the number, there is real commercial activity, not necessarily fraudulent, but executed with questionable methods that generate rejection in most of those who receive it.
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