Still no signal on IPhone 10

My IPhone 10 has still not been activated, no signal when I use the Vodacom Simcard. But yet, it works perfectly with a Telkom Simcard. I received a phonecall from Fergi on 8/8/25 as a follow up. On 7/8/25 I upgraded to and IPhone 16. Inserted simcard and voila, no problem. The technician in store copied the old phone to the new phone.