To your original question, we used Data Cards for Data Throughput and for CSFB, 1 Device MO & 2nd Device MT to ensure we seeing success on both ends. As when LTE/VoLte launched, we noticed sometimes multiple issues on MT end like missing paging in 3G, or Attach Rejections etc. And 45 Seconds Call with 30 Seconds delay.
You can use either data card or normal phone, it doesnt matter so much anymore.
I normally use 1 scanner, 1 UE for DL/UL data test and 1 UE for CSFB MO and MT. Depending how much samples do you need you can also separate the DL and UL UE or MO and MT CSFB UE.
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