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Eles poderiam se comunicar, havia uma Rede de Resistência especial disponível para eles. Eles se conectaram à rede sem fio.
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O Force Awakens Visual Dictionary diz isso do BB-8:
The BB-8 tracking mode, which connects it to Resistance network, was neglectfully disabled prior to its latest mission
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A novela oficial do TFA por Foster elabora:
“How can I have committed such a devastating oversight?” the protocol droid continued. “When we sent Beebee-Ate off, it was my responsibility to perform his final checkout. Which I did, in most excellent and approved fashion. Except—except…” If a droid could have fallen to wailing, C-3PO would have done so on the spot. “I forgot to activate his long-range tracking mode! I must have assumed he would always be in the presence of that pilot and that therefore there would be no need. I deserve to have my memory wiped. Oh, Artoo, what am I to do? I wish you’d finally wake up, I need you now.”
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E então vemos C-3PO alertar a rede droid em outros planetas:
“What would your advice be? No doubt you’d have an opinion about sending a general alert to all our associate droids, in the hope that one of them might encounter Beebee-Ate or his ident signal.” Two hands, one gold and one red, rose slightly in realization. “Why, that’s brilliant! I will do just that. Artoo, you’re a genius!”
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... e um deles, no Takodana, responde:
Nearby, a small bipedal GA-97 droid who had been monitoring the pastime turned curiously to check the source of the excised limb. Though it initially focused on Rey, its attention was immediately drawn away from her and to the rotund droid at her side. Visual recognition ignited a small but very important internal sequence that concluded with the GA-97 sending out a compressed signal that was bounced around, coded, decoded, encrypted, and flashed out into deep space.
Where it very soon was picked up, decoded, and decrypted, to become the impetus for an electronic shout of joy.