If you have a Postpaid plan (Renta) or a high-use Amigo plan, you are likely accumulating . Many users forget these exist! You can redeem these points for airtime (reloads).
These payment platforms often have "Recompensas." For example, if you refer a friend to Mercado Pago, you both get $100 MXN. That equals two free Telcel recargas of $50 MXN each.