Media5-fone Android and iPhone

Download media5-fone from the App Store or Google Play and register your account using the following details:

Click on the ‘More’ tab, then click on Settings
Configure Sip Accounts
Click + to add a new account

Account:
Title: FreelyCall
Username: Your FreelyCall Account number (Ex: 2XXXX)
Password: Your FreelyCall password (Ex: Asr5aF2as16F)

Servers – SIP Server/Domain/Realm
Address: freelycall.com
port: 5060 (or 80 over UDP, or 8080 over TCP)

Servers – Outbound proxy
Enable Proxy: Yes
Address: freelycall.com
Port: 5060 (or 80 over UDP, or 8080 over TCP)

Servers – Transport
SIP Transport: UDP (consider TCP to save battery on your mobile)
Enabled SRTP: no

For more information, you can check:

http://www.media5corp.com/repository/iPhone/manuals/Media5-Fone_iPhone_UsersGuide.pdf
http://www.media5corp.com/repository/Android/manuals/Media5-Fone_Android_UsersGuide.pdf