Company lists · Data verified August 2026

Top 9 Customer retention call centers based in Spain

Name: Customer retention call centers based in Spain
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 36 companies tracked

There are 36 customer retention call centers headquartered in Spain (RevenueBase, August 2026). RevenueBase tracks 1,754 professional contacts across them, including 57 with verified work emails and 6 with mobile numbers. Barcelona is the largest hub.

This list covers customer retention call centers headquartered in Spain, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

36Companies

1,754Contacts tracked

57Verified emails

6Mobile numbers

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The 9 largest customer retention call centers based in Spain

Ranked by team size

Top 9 of 36 customer retention call centers based in Spain, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Fastco	Madrid	1,001-5,000	601	16
2	Unitono Contact Center	San Fernando De Henares	5,001-10,000	459	27
3	Stream Mobile	Cartes	501-1,000	157	5
4	Jcp2call	Malaga	501-1,000	39	1
5	CLICC	Barcelona	51-200	25	3
6	Call Center Barcelona	Barcelona	51-200	25	1
7	Grupo Dtel	Barcelona	51-200	21	1
8	Wedoup	Malaga	11-50	19	2
9	Boostcall	Barcelona	11-50	3	1

Showing 9 of 36 customer retention call centers based in Spain

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Customer retention call centers based in Spain at a glance

As of Aug 28, 2026

11-50Median size (employees)

BarcelonaLargest hub · 5 HQs

6Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Customer retention call centers by metro

Metro	Companies
Customer retention call centers in Barcelona	5
Customer retention call centers in Madrid	4
Customer retention call centers in Santander	2
Customer retention call centers in Malaga	2
Customer retention call centers in Terrassa	2
Customer retention call centers in Alboraya	1
Customer retention call centers in Sopuerta	1

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “customer retention call centers”, with match quality audited by blind human judging, and headquartered in Spain.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many customer retention call centers are there based in Spain?

There are 36 customer retention call centers headquartered in Spain as of August 2026 (RevenueBase).

What is the largest company on this list?

Fastco, headquartered in Madrid, tops this list with the largest team on record.

Which city has the most customer retention call centers?

Barcelona leads with 5 headquartered companies, followed by Madrid (4) and Santander (2).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 57 verified decision-maker contacts tracked across these 36 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph, the same data that powers RevenueBase's B2B data products and the free research portal.