Skype is a versatile communications software that you can download for free. Not only can it place calls, hold video conferences and support text-based chat, it comes in a mobile phone application. This means you can call your Skype contacts from anywhere you go. You can also subscribe to a calling plan to save spending minutes with your service provider. Most phone features, like speaker phone, are available through the Skype application.
Open the Skype application, and log in to your account.
Select the contact you wish to call, and press "Call."
Select the "Speaker" option to switch to speakerphone, then press it again to turn it off.