Mobile Connectivity — 220-1201 Study Guide

Unlock the complete study guide + 1,040 practice questions across 16 full exams.

Bundled into the existing CompTIA A+ Core 1 premium course — no separate purchase.

14-day money-back guarantee — no questions asked.

Included in this chapter:

The connectivity model: links and accounts
Wi-Fi and cellular data
Airplane mode and data caps
Sharing a connection: hotspot and tethering
Bluetooth pairing
VPN on mobile
Synchronizing mail, contacts, and calendar
How the exam frames mobile connectivity

Sharing a phone's cellular data: hotspot vs tethering

Attribute	Mobile hotspot	USB tethering	Bluetooth tethering
Transport	Wi-Fi (phone acts as AP)	USB cable	Bluetooth (PAN)
Devices supported	Several at once	One (the cabled device)	One
Typical speed	High	Highest and most stable	Lowest
Battery impact	Heavy (Wi-Fi radio stays on)	None (cable also charges)	Light
Best when	Sharing to multiple devices	One laptop, best reliability	One device, saving battery

Decision tree

Cheat sheet

Cheat sheet

A phone prefers Wi-Fi and falls back to metered cellular data
A wrong APN breaks mobile data while voice still works
GSM identifies the subscriber by a swappable SIM; CDMA by the carrier database
An eSIM is an embedded SIM you reprogram in software
A PRL update refreshes the CDMA roaming table over the air
Cellular data climbs 3G, 4G LTE, then 5G
Only airplane mode cuts every radio at once
Wi-Fi trades range for speed across 2.4, 5, and 6 GHz
Sharing pushes the phone's own cellular link outward
Only a Wi-Fi hotspot serves several devices; tethering serves one
Shared devices spend the phone's cellular data cap
Bluetooth pairing runs enable, discoverable, select, confirm PIN, test
Paired Bluetooth devices reconnect automatically after the first time
Bluetooth is a short-range 2.4 GHz personal-area link
A VPN encrypts traffic over a link it does not create
A mobile VPN needs a server address, protocol, and authentication
Always-on VPN reconnects itself; per-app VPN routes only chosen apps
IMAP syncs mail across devices; POP3 downloads to one
Exchange syncs the calendar and contacts that IMAP alone will not
Account sync works because the server holds the master copy
Syncing large data over cellular counts against the data cap
Wi-Fi calling carries voice over Wi-Fi when the signal is weak

Unlock with Premium — includes all practice exams and the complete study guide.

References