can pair with more than 1 devices (max 3 devices) but never tried pairing to 2 phones at the same time. Maybe will give a try when i am free. I tried listen to the build in FM radio and testing calling in, MW600 will switch to phone immediately.

if you dun intend to use mobile plan then get from seng heng and use WiFi at home and free hotspot when outside. If you are lite user then maybe can consider DiGi SmartPlan lite.

But DiGi Smarplan (not lite) should be most cost effective if you have the budget. Simple comparison:
1. buy from DiGi with Smartplan (unlimited up to 3GB quota) - RM1,699 + RM68 x 12 = RM2,515.
2. buy from SenHeng and sign up SmartPlan lite - RM2,199 + RM33 x 12 = RM2,595.
3. buy from SenHeng and no data plan at all - RM2,199 (I am not very sure of the latest price, this is just my estimate).

If you compare 1 & 3, you are only paying RM26.33 extra a month for unlimited data for 1 year. Of course if your area has no DiGi coverage then too bad.

Most using Papago X5 with malfreemap which is updated every month.