...and kept her phone charged? Maybe she had some Google account she used with the nearest device to call him with.
But either way. The scene with the "confirmation" was totally unnecessary and sloppy. Just wait and see, man.
Hugs
If they were on a family plan, as long as he kept the plan as is her phone would have remained active.
shareAnd why is Peter Parker back in high school? It's 5 years later. Just take the GED. You know he would pass.
shareBecause he's 16 years old. No one who was snapped aged a minute while they were gone.
Though no one has said, Flash, Ned and MJ all probably snapped too. So they will all need to go back to school when they come back; just like millions of other students who were snapped.
And no, it isn't a violation of probability that Peter and his three friends were all snapped.
You know people still have landlines right?
shareboring answer:
given his line of work combined with his dedication to his family, I'd assume he has some kind of "always on / worldwide roaming" plan for all his family's phones
As for keeping it charged, it's not a stretch to think he left everything in the home the way it was, so her phone was probably plugged in when she set up the picnic
Why the need for all these excuse answers?
Hawkeye knew the plan all along was to reverse the snap and bring everyone back.
Therefore he buys a new phone before they set off and leaves it with a message to call him asap on their kitchen table. He then creates a new contact with this phone's number and her name on his own phone.
And that's it... No need for any elaborate daftness.