12v socket not providing enough current for mobile phone?
The socket can handle 1 amp if hooked up correctly. That does not mean you can tap off any circuit and get 1 amp. Wire directly to the battery.The phone draws about 4.5W. (0.9A at 5V). The battery is probably a Li-Ion 1750 mAh battery. You need about 1.5A charge circuit, that will get you about 7.5W. But the consumption I think will always be greater than the charge rate with that small of a battery. Try a higher capacity battery, or if you really wanted to get crazy, shell out an old battery, wire it to the terminals, less the battery, and use it as a "battery eliminator".