€5 of gift balance when you open your account with your business email
· 3 min
Open your SMSverifica account with your company email and we give you €5 of balance to try real sending of SMS, WhatsApp and Telegram.
Blog
How messaging is really integrated: code that works, prices that are actually charged and Spanish regulations explained without hype.
SMS for accounting and tax advisory firms: deadlines that do not slip and signed engagements
· 3 min
Tax deadline reminders in bursts, documentation requests on record and engagement letters signed by certified SMS.
SMS for estate agents: viewings that are not missed and reservations that get signed
· 3 min
Viewing reminders, documentation notices and a reservation contract signed by certified SMS. How to set it up from the dashboard or through the API.
How to register your SMS sender with the CNMC, step by step
· 4 min
Since 15-09-2026 SMS with an unregistered sender are blocked in Spain. A step-by-step guide to registering in the CNMC Alias Registry.
Bulk SMS in retail: lawful promotions and a registered sender
· 3 min
SMS campaigns that sell without risking fines: LSSI consent, the Robinson List, sending hours, and the CNMC Alias Registry since September.
Certified SMS for homeowners' associations: when it helps and when it does not
· 3 min
Payment demands, special levies and arrears notices with proof of delivery. What a property manager can prove with a certified SMS and what not.
Garages: quotes accepted by SMS and extra work with a signature
· 3 min
The acceptance of the quote and any extra work, signed from the customer's phone with an OTP code and an evidence file. Fewer arguments at handover.
Insurance: objecting to renewal and other letters you have to prove
· 3 min
The Spanish Insurance Contract Act sets deadlines for communications between the parties. How to prove renewals, claims and notices with certified SMS.
Lawful WhatsApp marketing in Spain: consent or a fine
· 3 min
What the LSSI requires to send promotions by WhatsApp or SMS, when a prior relationship with the customer is enough, and how opt-outs and proof work.
Notifying a change of terms and being able to prove it: certified SMS
· 3 min
SaaS, energy, insurance or telecoms: if you change an ongoing contract you must communicate it and be able to prove you did. How the proof is kept.
OTP by WhatsApp or by SMS: which is better for verifying users
· 3 min
Meta's authentication category versus good old SMS. Costs, coverage, delivery failures and why the right answer is usually both.
Payment demands by certified SMS: interrupting the limitation period
· 3 min
How to claim a debt out of court with proof of delivery, what the law requires and the limits a serious law firm never crosses.
Signing employment contracts and annexes by SMS: how to do it right
· 3 min
Temporary contracts, remote-work agreements and internal policies signed with an OTP to the employee's phone. What the law requires and what proof remains.
Signing a rental reservation by SMS: a certified contract with OTP
· 3 min
Deposit, reservation or earnest money signed from the phone in two minutes. How signing with an SMS code works and what evidential value it really has.
SMS appointment reminders for clinics without breaching the GDPR
· 3 min
Fewer missed appointments without revealing health data. What a clinic's SMS can say, what it must never say and how to document consents.
SMS verification at user sign-up: OTP without holes
· 3 min
One-time codes that expire, are never stored in plain text and resist fraud. How to build phone verification with two API calls.
Telegram for business: alerts where email does not reach
· 3 min
System, order and team alerts through a Telegram bot: how the chat is captured, what each message costs and what it is NOT the right channel for.
Customer service on WhatsApp: the 24-hour window explained
· 3 min
Answering enquiries through the WhatsApp Business API without templates: how the service window works, what it costs and how not to leave tickets half-done.
WhatsApp utility for e-commerce: order notices that actually get read
· 3 min
Confirmation, shipping and delivery on WhatsApp with Meta's utility templates. What Meta requires, what it really costs and when an SMS is still better.
If you were an SMSverificados customer, here is what changes (and your balance comes with you)
· 5 min
SMSverificados becomes SMSverifica: same company, new platform. How to create your account, transfer your balance and what is better than before.
Your SMS delivery receipt is lying (and in which countries)
· 4 min
A "delivered" SMS did not always reach the phone. What each country's receipt confirms, how to tell them apart and what to do about lost OTPs.