Nokia 6700 classic support

No, you can't. Series 40 devices run on java-based application with .jar file extension.

Select Menu > Settings > Display (or Main display) > Font size.

You can activate call divert to voice mailbox so that the caller can leave messages to your voice mailbox when you are not available.

To activate call divert, select Menu > Settings > Call > Call divert, (for dual SIM devices, select the SIM card to use), and select If not available or If out of reach > Activate > To voice mailbox and enter the voice mailbox number which you get from your service provider.

Select Menu > Settings > Enhancements (or Accessories) > Charger > Lights > Automatic.

Select Menu > Settings > Call > Voice clarity > Active, then make a new call.

Select Menu > Settings > Call > Call divert (or Call forwarding). For dual SIM devices, select the SIM card to use if prompted. And then choose Divert all voice calls (or All voice calls) or do so in certain situations. Then enter your voice mailbox number which you get from your service provider. 

The light effects are normally associated with incoming calls, missed call notifications and received SMS messages. The light effects may vary between your Nokia device and another Nokia device.

To turn on or off the light effects, select Menu > Settings > Lights > Light effects.

Select Menu > Contacts > Settings and from the following options:

• Memory in use - to select the SIM card or phone memory for your contacts. Select "Phone and SIM" to recall names and number from both memories. In that case, when you save names and numbers, they are saved in the phone memory.
• Contacts view - to select how the names and numbers in Contacts are displayed
• Name display - to select whether the contact's first or last name is displayed first
• Font size - to set the font size for the list of contacts
• Memory status - to view the free and used memory capacity

When using predictive text input, if a question mark (?) is shown after the word you entered, the word you intended to write is not in the dictionary. To add the word to the dictionary, select Spell, enter the word and save it.

Note: You cannot manually delete words that were added to your dictionary. When the dictionary is full, the most recent addition replaces the first.

When the fixed dialling is on, SMS sending works only to the numbers saved in the fixed dialling number list. In addition, the SMSC (Short Message Service Center) number should be added to fixed dialing list and it is the same as in the message settings.