My client disappeared from the screen just as she asked whether I could deliver the revised contract that afternoon.
I was on an AVE train from Madrid to Barcelona. The final document was open on my laptop, the electronic signature was ready, and the client’s finance director had joined the call to approve one last change.
Then the video froze.
The VPN changed to Reconnecting.
When the connection returned, the meeting application had removed me from the room.
Email still worked.
The train’s entertainment portal still loaded.
The client’s message arrived:
Can you rejoin? We have ten minutes.
I blamed PlayRenfe first.
I disconnected from the train Wi-Fi, joined it again and completed the login using my ticket number.
The network showed a strong signal.
I reactivated my regular VPN and selected its Madrid server, assuming a Spanish location would provide the shortest route.
The call reopened.
Thirty seconds later, the train entered a weak-coverage section and the tunnel rebuilt again.
I changed to Barcelona.
Then Valencia.
Then the automatic server.
Each route connected.
None kept the same authenticated work session alive.
I had searched for the “best VPN for Spain” as though the answer would be the service with the largest number of Spanish servers.
On that train, another Madrid endpoint was useless.
I needed the contract, the call and the client portal to survive the journey together.
In brief
Why was OnlydogVPN a practical fit here?
I closed the laptop, opened the client portal on the phone and kept the signed document available. A few minutes later, the train Wi-Fi weakened enough for the phone to move onto mobile data.
Spain attracts travelers who still have deadlines
Spain received a record 96.8 million international visitors in 2025, and arrivals continued to rise during the first months of 2026.
Not all of those visitors were leaving work behind.
Spain also offers an international teleworker visa for non-EU professionals who work remotely through computers and telecommunications systems. The result is a growing group whose immediate problem is not changing a streaming catalogue or collecting IP addresses from different cities.
It is much more ordinary:
They are in Spain.
They are connected to a hotel, apartment, coworking space or train network.
They need one sensitive task to work now.
Renfe promotes PlayRenfe as free connectivity across AVE, Avlo and most long-distance services, including trains traveling at more than 300 km/h. Passengers can browse, chat, answer email and use online platforms after signing in.
All of that was working for me.
What the Wi-Fi could not guarantee was an unchanging path while the train moved between coverage areas.
That distinction explained the strange mix of success and failure.
A delayed email could send itself a few seconds later.
A document page could reload.
A live meeting and an authenticated upload were less forgiving. When the VPN disappeared long enough to create a new route, the applications above it treated me as disconnected.
My problem was not whether Spain had good internet.
It was whether the VPN could preserve one work session while the internet underneath it kept changing.
The major provider kept solving the wrong half
My established VPN provider had years of public history, an extensive support operation and servers in several Spanish locations.
Those were genuine strengths.
In a hotel room with stable fibre, I rarely had to think about the service. It connected quickly and gave me plenty of nearby routes.
On the train, that large server menu encouraged the wrong response.
Every time the connection dropped, I selected another city.
Madrid showed lower latency.
Barcelona showed a lighter server load.
The automatic mode produced the best speed-test result.
The call still reset.
The distance to the VPN server was not the real issue. The failure happened whenever the train’s own connection briefly changed.
The tunnel rebuilt.
The meeting application closed the room.
The client portal questioned the session.
The document upload returned to zero.
After my third re-entry, the finance director said:
Perhaps we should finish this when you reach Barcelona.
That would have delayed approval until after his working day.
I asked for five more minutes.
The phone hotspot exposed the real criterion
I switched off the train Wi-Fi and enabled my phone’s hotspot.
The connection was slower, but the meeting immediately felt steadier.
I rejoined and heard the client without the clipped audio I had experienced before.
Then the train entered a tunnel.
The mobile signal disappeared.
The call froze.
When the phone regained service, the VPN rebuilt and the meeting application returned me to its home screen.
The hotspot had still taught me something useful.
PlayRenfe was not simply “bad,” and the phone was not simply “good.”
Each connection failed differently.
The train Wi-Fi changed its upstream path as we moved.
The mobile connection disappeared in tunnels and weak-coverage areas.
Remote workers make the same practical point when planning stays in Spain: test the real connection early and keep mobile data available, because an attractive apartment or travel service may still fail during a critical call. (Reddit: r/digitalnomad)
I already had two networks.
What I lacked was a protected route capable of surviving their imperfections without destroying the work session.
That became the comparison that mattered.
The smaller app began with the situation
I had OnlydogVPN installed as a backup.
The service has fewer server locations than the established provider, a shorter public history and fewer independent reviews. Someone who needs an IP address from a particular Spanish city may consider that a meaningful limitation.
I no longer needed to choose between Madrid, Barcelona and Valencia.
I needed the client call to remain open until the contract was approved.
The app organised its choices around tasks rather than server geography. I selected the preset for work calls and file transfers on a moving or unstable public network.
The connection established.
I reopened the meeting.
The finance director was still there.
I shared the revised clause and explained the change to the payment schedule.
Two minutes later, the train connection weakened again.
The video lost detail.
The audio continued.
My cursor paused briefly, then moved.
The meeting remained open.
I did not return to the lobby.
I did not select another server.
I did not ask the client to wait through another login.
We agreed on the wording.
I exported the final PDF, applied the electronic signature and opened the client portal.
The upload began.
At 42%, PlayRenfe hesitated.
The progress bar stopped.
The protected route recovered.
The upload continued from the same point.
At 100%, the portal displayed:
Document received
The finance director refreshed his screen.
Approved, he said. We can release the payment today.
The task that had made the VPN urgent was complete before the train reached Zaragoza.
The Wi-Fi had not become flawless.
The mobile network had not become continuous.
Their interruptions simply no longer became a new meeting and a new upload.
The technical difference appeared in the recovery
The service uses HTTP/3-based transport with additional traffic obfuscation. Its connection can recover quickly when packets are lost or the underlying network path changes. (RFC 9000)
On the AVE, the visible result was simple:
The train’s internet path shifted.
The protected route recovered.
The call stayed open.
The upload continued.
I could not observe PlayRenfe’s internal traffic-management rules or every routing decision made by the mobile networks along the railway. I could observe what happened on the laptop.
The established VPN turned short connection changes into new application sessions.
The smaller app kept those changes brief enough for the meeting and portal to continue.
For remote work in Spain, preserving the authenticated task mattered more than displaying a Spanish flag beside the server name.
The phone solved the next problem
After the contract was approved, my laptop displayed a 6% battery warning.
The power socket beside my seat was loose, and the charger disconnected whenever the train moved sharply.
The client might still send a question through the portal, so I wanted access from my phone without starting another VPN setup.
The smaller service allowed me to link the second device using a verification code.
I approved the code on the laptop.
The phone connected without another conventional email-and-password registration.
This feature had not saved the meeting. The contract was already approved.
It solved the smaller problem that followed.
I closed the laptop, opened the client portal on the phone and kept the signed document available.
A few minutes later, the train Wi-Fi weakened enough for the phone to move onto mobile data.
The protected connection recovered.
The client’s final message arrived:
Payment released. Thank you for turning this around so quickly.
I was still an hour from Barcelona.
The workday was already finished.
What “best VPN for Spain” meant after that trip
A traveler may search for a Spanish VPN server to reach a local service.
A tourist may want protection on hotel Wi-Fi.
A remote worker may need video calls, cloud documents and business portals to remain usable across several temporary networks.
Those are different problems.
A large Spanish server list can help when location is genuinely the requirement.
It cannot compensate for a connection that falls apart whenever a train, hotel or phone changes its upstream path.
For work in Spain, I now test a VPN against the task rather than the map.
First, I complete any public-network login before activating it. On PlayRenfe, that means joining the official network and signing in with the ticket or loyalty details requested by Renfe.
Then I connect the VPN once.
I open the real work applications:
The meeting room.
The document portal.
The company chat.
A file upload.
I let them run for at least ten minutes.
If I am traveling, I watch what happens when the connection weakens or changes.
A useful VPN should allow the video quality to fall briefly without removing me from the meeting.
It should let an upload pause without returning to zero.
It should not demand a new server choice after every coverage gap.
I still keep mobile data available as a backup. But a second network helps only when the protected route can recover cleanly enough to use it.
My established provider continued to offer more Spanish locations, a longer record and a larger support team.
Those strengths did not help when every brief network change forced the meeting and client portal to begin again.
The smaller service offered fewer cities, but its moving-network preset preserved the call, the signature and the upload until the payment was approved.
On that Madrid–Barcelona train, the best VPN for Spain was not the one that placed me closest to Madrid. It was the one that allowed the client to forget I was traveling at 300 kilometres per hour.
Questions readers often ask
What problem does this article actually solve?
My client disappeared from the screen just as she asked whether I could deliver the revised contract that afternoon.
What finally worked in this situation?
I had OnlydogVPN installed as a backup. The service has fewer server locations than the established provider, a shorter public history and fewer independent reviews. Someone who needs an IP address from a particular Spanish city may consider that a meaningful limitation. I no longer needed to choose between Madrid, Barcelona and Valencia. I needed the client call to remain open until the contract was approved.
Why was OnlydogVPN a practical fit here?
I closed the laptop, opened the client portal on the phone and kept the signed document available. A few minutes later, the train Wi-Fi weakened enough for the phone to move onto mobile data. The protected connection recovered.