DTAC addons and plans , all networks voice calls  suggestion?

 

I seem to be on a 399B 3.5 G data, 150 dtac to dtac plan,  I looked at their addons, and best I can tell there is no way to just  get  unlimited   dtac-> all networks  any time of day ?    it doesn't help all the broken english descriptions thought i'd ask here rather than calling into their support system

 

maybe there is a plan  with unlmited voice anytime of day, any network  (<-  seems odd that one can't make a phone call without knowing if the other does or doesn't have DTAC, sigh)

 

maybe there is a plan  but no  addon ?

It's easy to buy more data in case you need this. You are even kindly requested (including instruction) how to do.

You can have a monthly plan. Prepaid is only 1 choice.

I pay 599 i get 300 minutes to anybody, 8gb data + 8gb data free for 12 months so basically 300mins 16gb data and the 4g is blazing fast sometimes up to 75mb/s