An executive of Mexican iPhone carrier Telcel has indicated that Apple plans to release a revised version of its iPhone 4 that will fix the handset’s antenna issues. Recounting a report from Mexico’s CanalMX, Mac Rumors reports that Marco Quatorze, Telcel’s Director of Value Added Services, said current iPhone 4s being sold in Mexico are the same hardware as is being sold elsewhere, but as of September 30, Apple will begin shipping…