diff --git a/src/app/(protected)/workorders/_components/wizard/use-wizard-create-with-technicians.ts b/src/app/(protected)/workorders/_components/wizard/use-wizard-create-with-technicians.ts
index fe0f1950..a18f1550 100644
--- a/src/app/(protected)/workorders/_components/wizard/use-wizard-create-with-technicians.ts
+++ b/src/app/(protected)/workorders/_components/wizard/use-wizard-create-with-technicians.ts
@@ -1,5 +1,6 @@
 import { toast } from "react-toastify";
 import { useAddTechniciansToCompany } from "@/domain/vendors/use-cases/use-add-technicians-to-company";
+import { isValidNorthAmericanPhone } from "@/domain/vendors/schemas/vendor-roster-schema";
 import type { VendorDropdownItem } from "@/domain/work-orders/types/work-order";
 import type {
   WizardNewTechnician,
@@ -56,6 +57,13 @@ export function useWizardCreateWithTechnicians({
       createMutation.mutate(draft);
       return;
     }
+    // Mirror the vendor roster schema so an unparseable phone is caught here with a
+    // clear message instead of failing the roster PATCH and blocking Create with the
+    // raw backend sentence. A blank phone stays valid, matching the modal path.
+    if (pending.some((technician) => !isValidNorthAmericanPhone(technician.phone))) {
+      toast.error("Enter a 10-digit phone number for each new technician.");
+      return;
+    }
     const anchor = vendors.find((vendor) => vendor.companyName === company);
     if (!anchor) {
       toast.error("Select an existing vendor company before adding technicians.");
diff --git a/src/test/app/(protected)/workorders/wizard-vendor-inline-technician.test.tsx b/src/test/app/(protected)/workorders/wizard-vendor-inline-technician.test.tsx
index 96d7b612..1774db4f 100644
--- a/src/test/app/(protected)/workorders/wizard-vendor-inline-technician.test.tsx
+++ b/src/test/app/(protected)/workorders/wizard-vendor-inline-technician.test.tsx
@@ -196,6 +196,48 @@ describe("useWizardCreateWithTechnicians (SH-364)", () => {
     expect(createMutation.mutate).toHaveBeenCalledWith(expect.objectContaining(expectedPatch));
   });
 
+  it("blocks Create and skips the roster save when a staged phone is not a valid number", async () => {
+    const createMutation = { mutate: vi.fn(), isPending: false };
+    const { result } = renderHook(() =>
+      useWizardCreateWithTechnicians({ vendors, patchDraft: vi.fn(), createMutation }),
+    );
+
+    await act(async () => {
+      result.current.mutate(
+        draftWith({
+          vendorCompany: "Vinewood LLC",
+          newTechnicians: [{ name: "Jordan Lee", phone: "(314) 555-01" }],
+        }),
+      );
+    });
+
+    expect(mutateAsync).not.toHaveBeenCalled();
+    expect(createMutation.mutate).not.toHaveBeenCalled();
+  });
+
+  it("allows a staged technician with a blank phone, matching the modal path", async () => {
+    mutateAsync.mockResolvedValue([{ ...vendors[0], id: 99, contactName: "Jordan Lee" }]);
+    const createMutation = { mutate: vi.fn(), isPending: false };
+    const { result } = renderHook(() =>
+      useWizardCreateWithTechnicians({ vendors, patchDraft: vi.fn(), createMutation }),
+    );
+
+    await act(async () => {
+      result.current.mutate(
+        draftWith({
+          vendorCompany: "Vinewood LLC",
+          newTechnicians: [{ name: "Jordan Lee", phone: "" }],
+        }),
+      );
+    });
+
+    expect(mutateAsync).toHaveBeenCalledWith({
+      anchorVendorId: 41,
+      technicians: [{ contactName: "Jordan Lee", phone: "", tradeSpecialties: "HVAC" }],
+    });
+    expect(createMutation.mutate).toHaveBeenCalled();
+  });
+
   it("does not create the work order when the technician save fails", async () => {
     mutateAsync.mockRejectedValue(new Error("boom"));
     const createMutation = { mutate: vi.fn(), isPending: false };