VoIP Phones - zoiper

You can download a part-configured Zoipier from here: Configuration instructions for Android and iOS

You can purchase Zoiper here: https://www.zoiper.com/en/shop/buy/zoiper5

Be aware that some features of Zoipier (eg push notifications) results in Zoipier's servers being a registration proxy, and so call data will be pass through their servers. This is explained on https://www.zoiper.com/en/support/home/article/205/Zoiper%20Push%20Proxy

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Zoiper 3.46.1 example on an iPhone.

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  1. Download App and go to Settings -> Accounts & select 'Yes'
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  2. Click 'Select a provider'
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  3. Select 'AAISP'
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  4. Enter your VoIP number (+44...) and SIP password then click 'Register'