In order to use SMS2SIP you need an account from one of the following VoIP providers:
- freecall.com
- internetcalls.com
- justvoip.com
- lowratevoip.com
- netappel.fr
- poivy.com
- sipdiscount.com
- sparvoip.de
- voipbuster.com
- voipbusterpro.com
- voipcheap.co.uk
- voipcheap.com
- voipdiscount.com
- voipstunt.com
- webcalldirect.com
- voicetrading.com
- smsdiscount.com
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