Why Choose Keith Thomas
• 20 years of experience as a Senior Apple Support Specialist at Apple Computer UK HQ.
• Former Apple Computer UK Mac Support Specialist and Apple Authorised Service Provider background.
• Established and Independent since 2010 for on‑site Apple Support Service – no call centres, no outsourcing, no hardware repairs. Over 25,000+ Apple problems resolved. Unique on-site Apple Support Service. backed up with Independent Apple Telephone Support Assistance.
• Trusted by home users, small businesses, and professionals across London and the South East UK.• Clear, honest, software‑only support. No Hardware Repairs. Expert Apple Consultancy Service.
On‑site iPhone and Mobile Network Support in London and the South East UK
What this page covers
This guide explains the most common reasons why an iPhone cannot make or receive calls, the steps you can try yourself, and when it’s time to get professional on‑site help. It applies to:
• iPhone 17 / 17 Pro / 17 Pro Max / iPhone Air
• iPhone 16 / 16 Pro / 16 Pro Max
• iPhone 15 / 15 Pro
• iPhone 14 / 14 Pro
• iPhone 13 / 13 Pro
• iPhone 12 / 12 Pro
• iPhone SE (2nd and 3rd generation)
And all UK mobile networks including EE, O2, Vodafone, Three, Sky Mobile, BT Mobile, Virgin Media O2 and Tesco Mobile.
The most common call problems
These are the issues Keith Thomas sees most often during on‑site visits:
• iPhone cannot make calls
• iPhone cannot receive calls
• Calls dropping immediately
• iPhone says “Call Failed”
• iPhone says “No Service”
• iPhone stuck on SOS mode
• iPhone cannot make calls after update
• iPhone cannot make calls after switching networks
• iPhone cannot make calls abroad
Quick checks you can do yourself
These steps solve around 50% of call issues.
Check 1 – Restart the iPhone
Check 2 – Turn Airplane Mode off and on
Check 3 – Check mobile signal strength
Check 4 – Turn off Wi‑Fi Calling temporarily
Check 5 – Make sure Do Not Disturb is off
iPhone cannot make calls
This usually means:
• Network outage
• SIM activation issue
• Incorrect network settings
Try:
• Restarting the iPhone
• Removing and reinserting the SIM
• Checking for carrier settings updates
iPhone cannot receive calls
This usually means:
• Call forwarding enabled
• Silence Unknown Callers enabled
• Network registration issue
Try:
• Turning off Silence Unknown Callers
• Turning off Call Forwarding
• Restarting the iPhone
iPhone says “Call Failed”
This usually means:
• Weak signal
• Network congestion
• Temporary routing issue
Try:
• Moving to an area with better signal
• Restarting the iPhone
• Turning Wi‑Fi Calling off temporarily
iPhone stuck on SOS mode
This usually means:
• SIM not registered on the network
• Network outage
• Porting delay after switching networks
Try:
• Restarting the iPhone
• Removing and reinserting the SIM
• Contacting your mobile provider
iPhone cannot make or receive calls after update
This usually means:
• Network settings reset during update
• Carrier settings update required
• Temporary iOS bug
Try:
• Resetting network settings
• Checking for carrier settings updates
• Restarting the iPhone
iPhone cannot make or receive calls after switching networks
This usually means:
• SIM not activated yet
• Porting delay (PAC code transfer)
• Incorrect APN or carrier settings
Try:
• Restarting the iPhone
• Turning Airplane Mode off and on
• Contacting your mobile provider
iPhone cannot make calls abroad
This usually means:
• Roaming disabled
• Network not supporting roaming calls
• Temporary roaming network issue
Try:
• Turning on Data Roaming
• Restarting the iPhone
• Selecting a different roaming network manually
When DIY stops working
You should get on‑site help if:
• Calls will not connect at all
• Calls drop immediately
• Calls work on another phone but not your iPhone
• Calls stopped working after an update
These issues usually require:
• iPhone call and network configuration repair
• Mobile provider diagnostics
• APN and carrier settings repair
• Apple Account and iCloud network checks
On‑Site iPhone Support – London & South East UK
If your iPhone cannot make or receive calls, Keith Thomas provides an often same‑day on‑site support service across:
• Central London
• West, North, South and East London
• Surrey
• Berkshire
• Hampshire
• Wiltshire
Keith Thomas is an Apple Support Specialist in:
• iPhone call and network issues
• Apple Account and iCloud network configuration
• Mobile provider troubleshooting
• iPhone configuration and repair
Book on‑site help in London and the South East UK
If your iPhone cannot make or receive calls, Keith Thomas can visit your home or office and get everything working again.
Keith Thomas – Apple Support Specialist
Established 2010 – Open 09:30–20:30, 7 Days
Contact Keith Thomas by Telephone: 07800 940756 or by Text to: 07800 940756, or simply complete an online website contact form 24/7