だけど
dakedo

Conjunction

1. but; however; although

、電話 でんわしてみたらしいんだけど、その電話 でんわ さき相手 あいてってのが問題 もんだいだったのよ。
de denwa shite mitara shiindakedo sono denwasakino aitette noga mondaidattanoyo.
And so it seems she tried phoning but it's who was on the other end of that phone that was the problem.