In every way you need to first deserialize the json using the related qctivity in webapi packages.let jobj is the output of deserialize json activity
Jobj(“ActiveSystems”)(0)(“PhoneNumber”).ToString.Trim will give complete number…now use text to left/right activity and gice the seprator as " "(space)…then text to right of it is what you need
Jobj("ActiveSystems")(0)("PhoneNumber").ToString.Trim.Split({" "},Stringsplitoptions.None)(1) use this is set variable activity with left side a string variavle and right as this formula
Here is you are having list of phone numbers and need to get each…then use for each activity with jobj("ActiveSystems") and inside the loop use currentItem("PhoneNumber").ToString and follow any of the above methods