Question about renewal

Hi, I have a furious gold dongle from a couple years back i have not use because i have been using another box. My other box does not unlock some of the phones i need, if i renew my furious gold dongle, can I unlock the Alcatel Idol 3 and Pop Astro?

The website says it can unlock with OTSmart? So if i renew will i have OTSmart?

There is another section for add credit to unlock i see on the website, what is that for?