@php
    use App\Models\Customer;

$customer = Customer::join('instalasi', 'instalasi.id_customer', 'customer.id_customer')->where('customer.id_unit_instalasi', 60)->get();
@endphp

@foreach ($customer as $cust)

{{ $cust->nama }} - {{ $cust->handphone }}

@php
    $customer_best_net = Customer::where('handphone', $cust->handphone)
        ->where('id_unit_instalasi', 24)
        ->first();
@endphp
@if ($customer_best_net)
    <br>
    <strong>Best Net:</strong> {{ $customer_best_net->nama }} - {{ $customer_best_net->handphone }}

@endif

<hr>

@endforeach