[When Digivolving] You may play 1 level 4 or lower digivolution card of 1 of your Digimon cards as another Digimon without paying its memory cost.
[Your Turn] All of your level 4 or lower Digimon gain <Jamming>. (This Digimon can't be deleted in battles against Security Digimon.)
Rulings Q&A — 3 entries
Q1Q1064
Do I have to activate this card's [When Evolving] effect?
Will this card's [Your Turn] effect result in my Level 4 Digimon with <Jamming> losing <Jamming> when Digivolving to Level 5 or above?
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Official Ruling
Yes, because the effect is only active during [Your Turn], the moment the Digimon becomes Level 5 or above, the effect no longer applies to the Digimon, and it will lose <Jamming>.