TECH.BLORGE.com | iPhone 5 4G LTE: You can keep your AT&T grandfathered unlimited plan TECH.BLORGE.com Good news for AT&T iPhone users with grandfathered unlimited data plans: Buying the new iPhone 5 with 4G LTE won't affect your unlimited data plan. If you have a grandfathered unlimited data plan with AT&T that means you likely bought an iPhone 3G way ... |