Rivals claim networking sharing deal could have breached Spanish competition laws.
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Yoigo joins bigger rivals in offering integrated telecoms packages thanks to an earlier deal with Movistar.
The proposed acquisition would have strengthened Vodafone’s position in home broadband, TV and telephone market.
Introduction of 4G+ in three cities could offer download speeds up to 300Mbps.
The huge fine, handed down for abusing its dominant broadband position, will have to be paid in full by Telefonica after its latest appeal failed.
Consolidation in Spain’s telecoms market continues as Orange picks up its smaller fixed and mobile rival.
Spain's biggest telecoms firm was found to have breached two rules regarding prices and access to SMS services.
Spain's two biggest cities account for three-quarters of its fibre broadband connections.
The Spanish telecoms giant has beaten its Italian rival to the Brazilian broadband provider.