It would appear that you've answered your own question. If he is getting released in four months and he can't add a Malvern number to his call list, then there would not seem to be any benefit. The flip side is that the call price differential is about $4.00 per call.
We have a high density of users of the InmateAid Discount telephone service users in The Omega Technical Violator Center and have not heard of the difficulty adding a number to their call list. The Arkansas Department of Corrections has been very cooperative in facilitating the transitioning of new line - if you decide that you need a number, we are here 24/7/365 to serve you.
https://www.inmateaid.com/ask-the-inmate/can-you-tell-me-if-it-would-benefit-me-to#answer
Accepted Answer Date Created: October 12,2015