With wireless prices creeping up, some phone users are reconsidering their options. That’s where promotional offers — like a new Costco and T-Mobile deal — come in. Between June 18 and July 20, 2025, Costco members can receive up to $450 per line when switching to T-Mobile and activating a new device on eligible plans, according to Costco Insider’s preview of the retailer’s July Coupon Book.
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