When travelling to the Azores Islands from the USA, Canada or Europe there are many advantages to using your own cell phone on the islands or purchasing a phone for 20-100 Euros depending on your style of phone and needs required. If you have an UNLOCKED cell phone, when you arrive in the Azores you can stop off at the airport or one of the locations for MEO, Vodafone or Nos Acores to activate a local number very easy, and it only takes a few minutes. The above companies are the main service providers in the Azores and have affordable plans for your European travel needs.
At the airport on Sao Miguel island in Ponta Delgada there are two small stores in the gift shop area of the airport where you can stop off and speak to a MEO or Vodafone agent about your needs and they can sell you a sim card for 20 Euros that you can just put into your phone or smartphone and get a local number. That way you can take advantage of the regional plans they offer or just pay as you go for the duration of your trip. The staff is very friendly and often speak English and German if Portuguese is not your native language. Everything is very easy to set up and you will have a local number to use in no time with all the information provided to you about your SIM Card purchase, local cell phone number and the plan. The SIM card usually comes with 5 or 10 euros worth of minutes on it as a start so it is recommended to add data or minutes depending on your needs. The data is quiet affordable! I used Vodafone and paid 25 Euros for 15gb of data for 15 days. It is more then enough data at about a 1gb a day for 2 weeks.