Talkatone

Talkatone is a smartphone app that enables users to make free phone calls and SMS texting via WiFi or 3G connection. In practice that means designing and building iOS and Android apps.

It makes the most sense for businesses launching or rebuilding an app. Alongside the main category they mention Audio, Mobile, Real Time and Wireless. As a small company team themselves (11 to 50 people), they tend to serve customers of a similar scale best. You will probably talk to the people who build it, which is great until you need 24/7 support.

Talkatone is based in Lucerne Valley, California and founded in 2010. Their site is talkatone.com.

Things worth asking about: portfolio quality, app store experience, and maintenance terms. Get the renewal terms in writing before the first invoice.

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