Из переписки с Симкомом получены ответы на некоторые вопросы.

По поводу отсутствия команды AT+HVOIC в даташите.

AT+HVOIC is not described in AT document. It has only execution syntax, AT+HVOIC<CR>. It is used to disconnect voice call when the voice and PPP dialing exist at the same time.

По серийному выпуску SIM5210.

We are going to release a standard version of SIM5210 and we are editing the new documents and application notes. These will be released later on. So far, the SIM5210 need a lot of customization. You can tell your customers about SIMCom 3G module SIM5210 but you should inform them that the advanced interfaces such as camera etc need be customized according to the quantity of their requirement. Most customers, from my viewpoint, it is better to try to standard version later on.