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A cheaper alternative (if there is an existing account) would tbe to get the account transferred. This will cost you about 40 Euros.
To have a telephone installed or reconnected, you must visit the local Telefónica office. Take along your passport or residence card (residencia), proof of your address and a copy of your property deed (escritura) or rental contract. If you're renting and don't have a residence permit (residencia) you must pay a deposit of around 200 Euros
Peak hours: from 0800 to 1700 hours from Monday to Friday and 0800 to 1400 on Saturdays
Normal: from 1700 to 2200, Monday to Friday.
Reduced: from 2200 to 0800 Monday to Friday, 1400 to 2400 on Saturdays and all day on Sundays. | 
Barcelona