Problem MKR nb1500 cant connect LTE/GSM

[andreas_hacked]

/*

 NB Scan Networks

 This example prints out the IMEI number of the modem,
 then checks to see if it's connected to a carrier.
 Then it scans for nearby networks and prints out their signal strengths.

 Circuit:
 * MKR NB 1500 board
 * Antenna
 * SIM card

 Created 8 Mar 2012
 by Tom Igoe, implemented by Javier Carazo
 Modified 4 Feb 2013
 by Scott Fitzgerald
*/

// libraries
#include <MKRNB.h>

#include "arduino_secrets.h" 
// Please enter your sensitive data in the Secret tab or arduino_secrets.h
// PIN Number
const char PINNUMBER[] = SECRET_PINNUMBER;

// initialize the library instance
NB nbAccess;     // include a 'true' parameter to enable debugging
NBScanner scannerNetworks;
NBModem modemTest;

// Save data variables
String IMEI = "";

// serial monitor result messages
String errortext = "ERROR";

void setup() {
  // initialize serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }

  Serial.println("NB IoT/LTE Cat M1 networks scanner");
  scannerNetworks.begin();

  // connection state
  boolean connected = false;

  // Start module
  // If your SIM has PIN, pass it as a parameter of begin() in quotes
  while (!connected) {
    if (nbAccess.begin(PINNUMBER) == NB_READY) {
      connected = true;
    } else {
      Serial.println("Not connected");
      delay(1000);
    }
  }

  // get modem parameters
  // IMEI, modem unique identifier
  Serial.print("Modem IMEI: ");
  IMEI = modemTest.getIMEI();
  IMEI.replace("\n", "");
  if (IMEI != NULL) {
    Serial.println(IMEI);
  }
}

void loop() {
  // currently connected carrier
  Serial.print("Current carrier: ");
  Serial.println(scannerNetworks.getCurrentCarrier());

  // returns strength and BER
  // signal strength in 0-31 scale. 31 means power > 51dBm
  // BER is the Bit Error Rate. 0-7 scale. 99=not detectable
  Serial.print("Signal Strength: ");
  Serial.print(scannerNetworks.getSignalStrength());
  Serial.println(" [0-31]");

  // scan for existing networks, displays a list of networks
  Serial.println("Scanning available networks. May take some seconds.");
  Serial.println(scannerNetworks.readNetworks());
  // wait ten seconds before scanning again
  delay(10000);
}

Current carrier:
NB IoT/LTE Cat M1 networks scanner
Modem IMEI: 35275309611xxxx
Current carrier: 202 05
Signal Strength: 18 [0-31]
Scanning available networks. May take some seconds.

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Im using this example for mkrnb1500 and got this answer from the board . It's stuck in Scanning for available netwroks. I use my personal phone sim for the project which i have 10g data , a lot of sms and unlimited data for calling , provider is Vodafone and the signal in this place is high . Do i need a specific sim for LTE /gsm communication? Should i buy a sim for nb-iot ? I live in Greece https://onomondo.com/iot-and-m2m-sim-card/the-best-iot-sim-cards-for-greece/?location=Greece , should i take this card?

[intstarep]

The MKR provides only LTE-M. I assume the antenna of the mobile provider not.
We need a full LTE MKR1600!