Deutsche Telekom shares plunged about 5% on April 22 after reports surfaced of early talks to fully merge with its U.S. subsidiary T-Mobile US. The news, first broken by Bloomberg , sent both stocks tumbling. T-Mobile dipped around 3.5% that afternoon. Investors fled. Why the panic? The proposed structure envisions a new holding company launching an all-share bid for both firms’ outstanding shares. Deutsche Telekom already controls 53% of T-Mobile, a stake built over 25 years from its original VoiceStream acquisition. Combined, the entity could boast nearly $300 billion in market value—eclipsing China Mobile—and serve over 200 million mobile subscribers. Morgan Stanley analysts see it bolstering financial muscle for more buys in a flatlining sector. But markets don’t buy the hype yet. Deutsche Telekom’s Frankfurt shares hit €27.39 midday, down 4.9%, per Yahoo Finance via Bloomberg . T-Mobile closed Tuesday at $195.39, off 1.5%, then extended losses.…